Dexter's Laboratory: Last Experiment/Transcript

This is the transcript for Dexter's Laboratory: Last Experiment (2025).

Part 1: Opening/Meet Dexter
(Shows Warner Bros. Pictures logo)

(Shows Warner Animation Group logo)

(Shows Jerry Bruckheimer Films logo)

(Shows Cartoon Network logo)

(The scene fades to the sun in the blue sky. The camera pans down to a small town. It's called Genius Grove. It's located near the city of Townsville. A boy appears on his bicycle, delivering newspapers to every house in the neighborhood. He throws one of them onto the doorstep of one particular home. It's a two-story pink house. The front door opens, revealing a tall woman with milky white skin, short red hair, green eyes, and red lips. She has big breasts, wide hips, and a large butt. She wears a pale green blouse-shirt with a wide collar, a white apron, gold earrings, dark green pants, dark green pumps, and yellow rubber gloves. Her name is Mary Spencer O'Reilly-McPherson. She picks up the newspaper, takes it inside, and reads it.)

Mary: Dee Dee! Can you please check if your brother's ready for school?

(The camera pans upstairs to Dee Dee's bedroom door. Dee Dee, Mary's daughter, appears as she peeks her head out of her room.)

Dee Dee: What did you say, Mom?!

Mary: (off-screen) I said, go check if Dexter's ready for school.

Dee Dee: Ahh!

(Dee Dee gets back into her room and slams the door shut. Then, she opens the door again and dances her way out of her room, across the hallway, and towards Dexter's bedroom door. Dee Dee reads the signs on the door reading "Police Line: Do Not Cross", "Stop", "Toxic", "No UVAs", "Away You Go", "Anti-Girl Zone", and "Beat It". Then, she gently knocks on the door.)

Dee Dee: (whispering) Dexter. Are you ready for school?

(Dee Dee sticks her ear on the door, waiting for a response from her brother. But all she can hear is silence.)

Dee Dee: Ohh. There doesn’t seem to be any answer. I guess I'll have to go inside. (rattles the doorknob) Ooh... the door is locked.

(Dee Dee then uses an express credit card to break the lock and open the door. She peeks into Dexter's room to find him. But he's nowhere to be found. So, she enters the room and races into Dexter's secret laboratory. There, she finds him working on a remote.)

Dexter: At last... my greatest work completed!

(Dexter kisses the remote loudly. He then takes it to place it on a red cushion on a column pedestal when he sees Dee Dee in his laboratory.)

Dee Dee: Hi!

Dexter: What— what— what are you doing in my laboratory?

Dee Dee: I'm just here to check up on my favorite little brother. (pinches Dexter's cheek)

Dexter: Stop that! I don't need you to check up on me! (starts pushing Dee Dee) So, please remove yourself from my laboratory!

Dee Dee: (notices something) Ooh! What's that? (runs towards what she's seeing)

Dexter: Ohh!

Dee Dee: (runs towards a DNA model) Ooh!

(Dee Dee vandalizes the DNA model by combining two long balloons from it to make a flower model. She giggles, then runs away.)

Dexter: (notices the flower balloon Dee Dee made) Aaaah!

(Dee Dee goes through Dexter's experiments in his laboratory, with Dexter giving chase.)

Dexter: Aaaah!

(As Dexter tries to stop Dee Dee, he ends up being thrown around and crushed by many of his inventions. Dee Dee's chaos is suddenly interrupted as she sees her doll on an operating table. She screams in terror and angrily turns to Dexter, who stops chasing her. She walks towards him, making him back up to a pedestal.)

Dee Dee: You were playing with my doll! I can't believe you would walk into my room, take my doll, take it back into your room, put it on your stinky, slimy machines, and then you...

(Dexter bumps into the pedestal, causing the remote to fly into Dee Dee's hands.)

Dee Dee: Oooooooh, what does this button do?

Dexter: (gets on his knees) Please, please! Do not push the button! You have no idea of what it...

(But it's too late. Dee Dee already presses the button on the remote. As a result, she transforms Dexter into a bunny rabbit.)

Dexter: ...does.

Dee Dee: Ooh! (picks up Dexter and hugs him) Look at the cute bunny rabbit!

Dexter: Let me go!

(Dexter breaks free from Dee Dee's grasp and picks up the remote.)

Dexter: Have you any idea of what you have done?

Dee Dee: Hmmm. No?

Dexter: Well, let me show you. What would you like to be more than anything else in the whole world?

Dee Dee: (gasps) Ooh. I want to be a beautiful princess with long golden hair and a big red bow.

(Dexter aims the remote at Dee Dee and presses the button as he transforms her into a bullfrog.)

Dee Dee: Then, I want to live in a big, big castle and have lots and lots of horses!

(Dexter hops his way to the pedestal and puts the remote back on the red cushion. Dee Dee steals it and runs away. Dexter appears again, pulling down a projection screen that shows the process of how the remote works. He begins explaining it to Dee Dee.)

Dexter: Now, do you understand?

(Dee Dee transforms Dexter into a pig.)

Dexter: That by combining the positive and negative polarities in sucrose radium...

(Dee Dee transforms Dexter into a buffalo.)

Dexter: We can excrete the elements from any variety of zitgaforme.

(Dee Dee transforms Dexter into an orangutan.)

Dexter: And unificate them with the superlative repercussions of the magnetic ospium.

(Dee Dee transforms Dexter into an ostrich.)

Dexter: Thusly, this machine should not be used by a--

(Dee Dee transforms Dexter into a hamster.)

Dexter: a person of lower intelligence, such as--

(Dexter stops when he realizes Dee Dee has the remote once again and is using it to transform him into various other animals. Dee Dee giggles with delight.)

Dexter: You are not listening to me!

(Dexter slams his stick on Dee Dee's hand. Because of that, she lets go of the remote, and he catches it.)

Dexter: Now pay attention!

(Dexter transforms Dee Dee into a tiger. She roars at him. Dexter runs away, and Dee Dee grabs the remote. Then, she chases him around with it. A fight ensues between the siblings, with Dee Dee turning Dexter into more animals such as a cow, a walrus, and a penguin as she chases him out of his own laboratory. Dee Dee slips on a skate on the stairs. Then, she falls down the stairs to the floor. Dexter hops on the button on the remote and presses it as he transforms her into a camel, then a vulture, then a snake, and then a whale. Meanwhile, Mary, Dexter's mother, is in the kitchen, still reading the newspaper.)

Mary: Make sure you two brush your teeth before you come down for breakfast.

(So, Dexter and Dee Dee, who have used the remote to transform each other into a beaver and a T-rex respectively, rush upstairs to the bathroom and brush their teeth. Then, they transform each other into a rooster and a bear, rush downstairs to the kitchen, and eat cereal and drink milk for breakfast.)

Mary: Kids! Chew your food.

(Dee Dee, as a bear, eats part of the kitchen table. Dexter is still eating his cereal. Mary walks over to the kitchen sink to wash the dishes.)

Mary: Now go upstairs and get ready for school.

(Dexter and Dee Dee see the remote and race towards it. Dexter grabs it and transforms Dee Dee into a goat. She chases him and headbutts him on the bottom, sending him back upstairs. He then transforms into a hippopotamus and runs away into his room from her. She busts through the door and proceeds to attack him. The scene cuts back to Mary in the kitchen.)

Mary: What are those kids up to?

(The scene cuts to Dexter and Dee Dee in his room. They fight over the remote and transform each other into various other animals such as an eagle, a panther, a crab, an octopus, and a chimpanzee. Soon, they stop and let go of the remote. It then falls onto the floor. Dexter is now a snail, and Dee Dee is now a turtle.)

Mary: (off-screen) That's it. I'm coming upstairs.

(So, Dexter and Dee Dee race to press the button on the remote and are successful just as Mary goes upstairs and opens the door to Dexter's room. Dexter and Dee Dee are now human again. The only difference is that they have switched bodies. Dexter is in Dee Dee's body, and Dee Dee is in Dexter's body.)

Mary: You kids stop fooling around and come downstairs, or you'll miss your bus.

(Mary walks away and goes back downstairs to the kitchen. Dee Dee, in Dexter's body, gets up and begins to speak.)

Dee Dee (in Dexter's body): Last one down is an icky, icky, slimy spider!

(Dee Dee dances out of Dexter's room.)

Dexter (in Dee Dee's body): Why not? I've been everything else today.

(Dexter casually walks out of his room and goes downstairs. The scene cuts to an exterior shot of Dexter's house. He walks out of the house and gets into the school bus. It then drives away. The scene fades to the same house in the afternoon. The school bus arrives and parks near it. Dexter and Dee Dee get off the bus, their bodies still switched. The bus drives away as Dexter and Dee Dee enter the house.)

Dexter (in Dee Dee's body): We need to use the remote to change us back to normal. I can't live my life in your body.

Dee Dee (in Dexter's body): And I can't live my life in yours.

Dexter (in Dee Dee's body): Let's go to my laboratory.

(So, Dexter and Dee Dee go upstairs to his room and go to his lab. Dexter walks up to the remote, grabs it, and looks at it.)

Dexter (in Dee Dee's body): Well, here goes nothing.

(Dexter presses the button. Soon, he and Dee Dee are back in their own bodies.)

Dexter: Did it work?

Dee Dee: Yeah!

(The siblings hug each other. Dexter then puts the remote back onto the pedestal.)

Dexter: We must never mess around with the remote ever again.

Dee Dee: Agreed.

(The siblings hug each other again. Then, they leave Dexter's lab. The camera pans up to the unlit Dexter's Laboratory logo hanging on the ceiling. It turns on and lights up, along with a subtitle at the bottom: "LAST EXPERIMENT", forming the film's title.)

DEXTER'S LABORATORY: LAST EXPERIMENT

(After three seconds, the logo darkens and turns off as the scene fades to black.)

Part 2: Ten Years Later/Meet Mandark
(The scene cuts to an exterior shot of Dexter's house.)

TEN YEARS LATER...

(The camera zooms in on Dexter's window. The scene cuts to an interior shot of Dexter's room. The camera pans over to Dexter, now an 18-year-old teenage boy, sleeping in his bed. He opens his eyes.)

Dexter: Ahh, what a fine day for science!

(Dexter gets out of bed and enters his secret laboratory. The camera pans to the side and reveals a desk full of science equipment. Also on the desk is a globe and a map of the world with notes and pins indicating Dexter's research. Dexter sits at his desk and starts working on his experiments. He works diligently, checking readings and making calculations. Suddenly, he hears a knock on the door.)

Dexter: Come in!

(The camera pans out of the laboratory to the door. Dee Dee opens it and enters Dexter's room. She is now a 20-year-old young adult. As usual, she sneaks into Dexter's lab. The scene cuts to Dexter looking at his latest invention that he completed.)

Dexter: At last! My greatest invention is now completed!

Dee Dee: Hey, Dex! What'cha doin'?

Dexter: Just working on some science experiments. It's all very fascinating!

Dee Dee: Wow, that's cool. Hey, I was wondering if you wanted to tell Mom and Dad about your secret lab before you leave for college.

Dexter: I'm not sure if that's a good idea.

Dee Dee: Come on, Dex! You've been keeping this a secret for ten years! Don't you think it's time to let them know?

Dexter: You're right. I should tell them. But how?

Dee Dee: I'll help you. I suggest that you use your science skills to make something that will convince Mom and Dad.

Dexter: But what will I make?

Dee Dee: Just use your imagination. I know I do.

Dexter: Alright, I'll give it a shot!

(So, Dexter starts working on his new invention while Dee Dee watches him do the work.)

Dee Dee: Oh, and by the way...

Dexter: Yes?

Dee Dee: I have feelings for you.

Dexter: Feelings? What kind of feelings?

Dee Dee: Romantic feelings. I love you, Dexter.

(Dexter looks at Dee Dee, and he knows she is serious. She has never been romantic with him before. Dexter feels very strange and nervous about the possibility of a romantic relationship. He doesn't know what to say.)

Dexter: I... I don't know what to say.

Dee Dee: It's okay. You don't have to say anything. Just think about it.

(Dexter looks away, trying to process what Dee Dee has just said. After a few moments of silence, he turns back to her.)

Dee Dee: Well?

Dexter: Well, Dee Dee, after a few seconds of careful consideration, I accept your feelings for me. Will you accept mine?

(To Dexter's surprise, Dee Dee accepts his romantic feelings for her.)

Dee Dee: Yes! I love you, Dexter.

Dexter: This is very confusing.

Dee Dee: I know. I've never been in a romantic relationship before.

Dexter: Me neither. But we shall make it official... with a kiss.

(So, Dexter and Dee Dee share a passionate kiss. After the kiss, they both smile and embrace each other. They both realize that this is the beginning of a true friendship, a romantic relationship, and a brother and sister bond that will last forever. The scene cuts to an exterior shot of Dexter's house. The camera pans over to a small two-story yellow house. Behind it is a large laboratory, which is much larger than the house. The scene cuts to a tall 18-year-old boy in his laboratory. His name is Susan "Mandark" Astronomanov. He's planning his world domination scheme. Suddenly, he hears laughter coming from outside.)

Mandark: What's this?

(The camera follows Mandark as he leaves his laboratory and goes to his room. He takes out his telescope and begins spying on Dexter and Dee Dee. The camera then pans over to Dexter's house. The scene cuts to Dexter and Dee Dee in his room. They're embracing each other and laughing. They both look very happy. The scene cuts back to Mandark in his room. He's spying on Dexter and Dee Dee with his telescope.)

Mandark: That Dexter! Always ruining my plans...

(Mandark shakes his fist angrily and storms back into his laboratory. The scene cuts back to Dexter and Dee Dee in his room. They wonder what's next for them.)

Dee Dee: So, what's next for us?

Dexter: Let's just take it one step at a time, Dee Dee.

Dee Dee: Sounds good to me.

(Dexter leans in for a kiss. He kisses Dee Dee on the cheek, which he doesn't intend to do. He tries again. This time, he does it right. He kisses her on the lips. And then he kisses her again on the lips for a little bit longer.)

Dexter: I think I love you, Dee Dee.

Dee Dee: I love you, too, Dex. And I think you love me, too.

Dexter: I do love you, Dee Dee.

Dee Dee: Me, too.

(Dexter and Dee Dee keep kissing. Eventually, he works up the courage to lay it on the line.)

Dexter: Will you marry me?

Dee Dee: Yes! Yes, I will marry you.

Dexter: Good. But we can't get married just yet. We'll do it after college. Okay?

Dee Dee: Okay.

Dexter: Good. Now, if you'll excuse me, I must return to work. Goodbye, Dee Dee.

Dee Dee: Bye, Dexter.

(Dee Dee dances out of Dexter's room while he returns to his secret lab and continues working on his invention. The scene cuts to Mandark in his laboratory. He's looking at the army of robots he has created. He's also looking at the world map with pins indicating his research. Mandark laughs evilly as he contemplates his plan for world domination.)

Mandark: Soon, the world will be mine to take!

(Mandark smiles sinisterly. Everything fades to black, save for his eyes. After three seconds, they fade away as well.)

Part 3: Dexter's Robotic Clone/Mandark Sneaks Into Dexter's Laboratory
(The scene fades to Dexter in his laboratory. He uses his scientific knowledge to create a robotic clone of himself that he can use to tell his parents about the lab. Soon, it is done.)

Dexter: At last! My greatest invention is now completed!

(Dee Dee enters Dexter's lab to see him.)

Dee Dee: Hi, Dexter. What'cha doin'?

Dexter: Oh, hello, Dee Dee. Fancy seeing you here. I made a robotic duplicate of myself. With this robot, I can show it to our parents and tell them about my secret laboratory. Look.

(Dexter shows his robotic clone to Dee Dee.)

Dexter: See? I can be anyone I want. This is me. And this is my duplicate.

Dee Dee: That's pretty slick, Dexter.

(But then, Dee Dee notices the power switch on the robot.)

Dee Dee: Oooooooh, what does this button do?

Dexter: No, wait!

(But it's too late. Dee Dee turns on the robot, and it begins to malfunction.)

Dee Dee: (as she backs away) Uh, what's happening?

(Soon, the robot goes rogue and starts to pursue Dee Dee, much to her horror.)

Dee Dee: Oh, help! I'm being chased by a rogue robot!

(As the robot chases Dee Dee around, it destroys most of the lab.)

Dee Dee: Dexter, help! Save me!

Dexter: Don't worry, Dee Dee! I'll rescue you!

(So, Dexter begins to chase his robotic clone, who is still chasing Dee Dee. After a few minutes of running, Dexter manages to catch up to the robot and deactivate it using a special remote device.)

Dexter: Phew, that was close.

(Dee Dee looks relieved.)

Dee Dee: Thanks, Dexter. I owe you one.

Dexter: Don't mention it. I guess I just learned my lesson: never trust a robot. I'll have to repair my robot and reprogram it to make sure it doesn't harm anyone or damage anything again.

(Dee Dee smiles and nods. After a few hours of cleaning up his lab and fixing his robot, Dexter returns to his room. The scene fades to Mandark in his laboratory. His plan for world domination is almost complete. He finishes working on his latest invention: a laser satellite weapon. He plans to use it to take over Genius Grove, then Townsville, and then the world. However, he needs a way to launch the satellite weapon into space. Suddenly, he remembers Dexter's robotic clone and has an idea.)

(The scene cuts to an exterior shot of Dexter's house at night. The camera pans over to Mandark's house. He sneaks out of his house and gets into Dexter's. Then, Mandark walks upstairs to Dexter's room. Then, he sneaks into Dexter's laboratory, steals his robotic clone, and modifies it to act as a satellite launcher. Then, Mandark sneaks back out of the house and returns to his laboratory. Once there, he launches the satellite weapon into space and begins his plan for world domination. The scene cuts to black. Then, it fades to an exterior shot of Dexter's house in the morning. The scene cuts to Dexter in his room. He's sleeping soundly. Then, he wakes up as he opens his eyes.)

Dexter: Ahh, what a fine day for science!

(Dexter gets out of bed and enters his secret laboratory. But then, he notices something missing.)

Dexter: Huh? Where has my robotic clone gone?

(Dexter looks out the window and sees Mandark's laboratory. He notices his robotic clone has been modified and realizes that Mandark must've snuck in and taken it.)

Dexter: Mandark! He must've snuck in while I was repairing the robot and taken it. I better investigate.

(The scene fades to Dexter entering Mandark's lab. Mandark is just finishing up his satellite weapon and doesn't realize that Dexter is there. Dexter watches as Mandark launches the weapon, and then he quickly hides. Mandark notices Dexter.)

Mandark: Well, well, well. If it isn't my rival and enemy, Dexter.

Dexter: So, Mandark, what do you think you're doing?

Mandark: Heh, I'm planning to take over the world.

Dexter: You won't get away with this!

Mandark: Oh, really? And why is that?

(Just then, Dee Dee enters Mandark's plan.)

Dee Dee: Because I'm here to stop you!

Mandark: (angered) Grrrr! You won't stop me! Robots! Exterminate them!

(Mandark's robot army charges toward Dexter and Dee Dee.)

Dee Dee: Let's get out of here!

(Dexter and Dee Dee run away from Mandark's robot army. They leave his laboratory and return to their house. Dexter and Dee Dee sigh in relief.)

Dexter: Well, that was close. But I think we're okay.

Dee Dee: I can't believe Mandark is planning to take over the world. We have to do something. Something.

(Dexter and Dee Dee think of a way to stop Mandark. Then, he has an idea.)

Dexter: We have to tell our parents about Mandark. Maybe they can stop him.

Dee Dee: Right. We'll tell them.

Part 4: Monkey and Agent Honeydew/Sneaking Into Mandark's Laboratory
(The scene fades to Dexter and Dee Dee's parents in the living room. Their names are Mary Spencer O'Reilly-McPherson and Hugh McPherson. Mary is Dexter and Dee Dee's mother, and Hugh is their father. They're watching Wheel of Fortune on TV. They turn to see their children.)

Mary: Look who it is, Hugh. It's our children: Dexter and Dee Dee.

Hugh: Wow, you're right, Mary. It is them.

Dexter: Hello, Mother and Father.

Dee Dee: Hi, Mom. Hi, Dad.

Mary: Hi, Dexter and Dee Dee.

Dexter: We have something important to tell you.

Mary: What is it, Dexter?

Hugh: Yeah! What is it?

Dexter: It's about Mandark.

Mary: What about him?

Dee Dee: Well, he's evil... and bad.

Dexter: Yeah. He plans to take over the world. We need to stop him!

Mary: We know, dearies. We'll do something.

Hugh: We can't stop him ourselves. But I know who can.

Mary: Who?

Hugh: Agent Honeydew. I just learned that she married a monkey named... well, Monkey.

Dexter: You mean my pet monkey named Monkey?

Hugh: Yep. That's the one. He and his wife, Agent Honeydew, are the only ones who can stop Mandark.

Dexter: Wow. That's amazing.

Dee Dee: Yeah! Let's go find Monkey and Agent Honeydew.

Mary: Okay. Let's get to it.

Hugh: Yeah. Let's go.

(So, Dexter, Dee Dee, and their parents leave the house to find Monkey and Agent Honeydew. After a long search, they find the couple in an abandoned warehouse. They are surrounded by Mandark's robotic minions. Monkey and Agent Honeydew are locked in a cage. They are relieved to see Dexter, Dee Dee, and their parents.)

Monkey: Dexter! Dee Dee! You made it!

Agent Honeydew: Thank goodness!

Mary: We're here to save you!

Hugh: Yeah! We'll take care of the minions.

(So, Dexter, Dee Dee, and their parents battle the minions. After a long fight, they manage to defeat the robots and free Monkey and Agent Honeydew from the cage.)

Monkey: Thank you!

Agent Honeydew: We owe you our lives.

Hugh: It's no problem. Now, let's go stop Mandark.

(So, together, Monkey, Agent Honeydew, Dexter, Dee Dee, and their parents head off to take down Mandark and save the world. While going to Mandark's laboratory, Dexter and Dee Dee hold hands. Their romance continues to grow, which is further complicated by the fact that Mary starts to feel jealous. Soon, they arrive.)

Dexter: Well, we're here. Mandark's laboratory.

Dee Dee: How are we going to get in?

Agent Honeydew: Don't worry. I have a plan. We will sneak in through the back entrance.

Monkey: That's a great idea!

(So, Monkey, Agent Honeydew, Dexter, Dee Dee, and their parents sneak into Mandark's laboratory through the back entrance.)

Dexter: Wow. We made it.

Dee Dee: Yeah. Now, let's find Mandark and stop him!

Dexter: Yes. Let's.

(Dexter and Dee Dee share a passionate kiss. But then, they see their parents, Mary and Hugh, watching them in shock.)

Mary: Dexter! Dee Dee! Are you two dating?

(Dexter and Dee Dee nod slowly.)

Mary: That's inappropriate!

Hugh: I'm sorry, but your mother is right. We can't allow you two to have a romantic relationship. We'll talk about it once this is done and over with. Okay?

Dexter and Dee Dee: (in unison) Okay.

Hugh: Good. Now come on! There's no time to waste.

(So, Monkey, Agent Honeydew, Dexter, Dee Dee, and their parents look around in Mandark's laboratory. Then, they find Mandark conducting experiments. He doesn't notice them. So, they hide and watch what he is doing. They see that he is trying to create a powerful weapon to take over the world.)

Dexter: Okay. So, what's the plan?

Agent Honeydew: Here's what we'll do. I'll distract Mandark and his robot army while you, Dee Dee, your parents, and Monkey sneak up the stairs and disable the weapon. Does that sound like a plan?

Dexter, Dee Dee, Mary, Hugh, and Monkey: (in unison) Yes!

Agent Honeydew: Good. Let's do it.

(Monkey, Agent Honeydew, Dexter, Dee Dee, and their parents all agree to the plan and head off to take down Mandark once and for all.)

Part 5: Dexter vs. Mandark
Coming soon!