(The episode fades in to a picture of a younger Dee Dee holding a rattle)
Mom: Aw, how precious!
(A picture of a pregnant Mom is shown with Dee Dee looking at her stomach)
Dad: Hey, look. There's you pregnant with Dexter.
(A picture of Dexter eating spaghetti while sitting in a high chair is shown)
Mom: Aw, his first spaghetti dinner...
(A picture of Dexter and Dee Dee in the bathtub is shown; Dee Dee is seen touching Dexter with her fist; Dexter is shown crying)
(He closes the photo album)
Dad: Ah... Isn't life grand?
(Dexter and Dee Dee's footsteps are heard; they enter the living room; Dee Dee is seen holding a poster)
Dexter & Dee Dee: Mom! Dad! Can we have some money to see a movie?
Dexter: Now, I know you two have fallen a bit behind the times, but opening today is a very important work of cinema.
(Dee Dee flips the poster around showing a feature film)
Dexter: Violance[sic]: Robot Vigilante!
(The entire poster is shown)
Dad: Hmm. I'm sorry kids, but Violance is too violent and mature for you two.
Dexter: What? Absurd!
Dad: But I'll tell you what, you can see it when you're older than your mother and I!
(He winks at the kids; Mom winks at him)
Dexter:*voice-over* Hmm, that shouldn't be too much of a problem. *out loud* Okay, you win. You're the parents.
Dad: Well, I'm glad to hear it's finally sunk in! Ha ha ha ha!
Dad: Uh, kids?
(The camera pulls back to reveal that Dexter and Dee Dee are gone; Mom and Dad look at each other and a question mark appears over their heads)
Dee Dee: What now?
Dexter: Simple, my dear Dee Dee. To the lab!
(In the lab, Dexter and Dee Dee are seen standing in front of the Accelor-Ager)
Dexter: Behold, the Accelor-Ager!
(A computer monitor is shown with Dexter and Dee Dee's future selves being shown)
Dexter: I will set the resulting ages over the hill.
(Dexter is looking at his watch)
Dexter: All right, let's get this over with. I don't want to miss the matinee.
(He and Dee Dee walk by an outlet with several signs plastered on the wall; Dexter walks to the other side of the cords and stops Dee Dee with the palm of his hand)
Dexter: Dee Dee, please use the utmost caution in proceeding to step over these wires.
Dee Dee: Okay.
(She steps on the cords, causing the plugs to unplug from their outlets; she looks at them)
Dee Dee: Oops. Whatever.
Dexter: Come on, Dee Dee!
(Dee Dee picks the plugs up and puts them back in the socket with the wires twisted)
Dee Dee: All ready!
(She steps inside the Acceler-Ager with Dexter and it starts up; the invention sends shockwaves outside of the house; a dog is transformed into a puppy; a man and a woman are both turned into babies; a girl skipping rope is also turned into a baby; back inside the lab, the doors to the Acceler-Ager open; Dexter and Dee Dee are the same)
Dee Dee: Hey, I don't feel any older.
Dexter: There seems to have been a slight malfunction. I'll just need to make a few adjustments. Probably just needs a good lube job.
(He walks past Monkey's cage; Monkey is shown to be wearing a diaper and sucking his thumb)
Dexter: Hello, baby Monkey. Now where did I put that big ol' wrench?
(He realizes what he just said)
Dexter: Baby Monkey?!? Einstein's ghost! What has happened? Computer, what the heck is going on?
Dexter: Hmm, yes, pee-pee... Computer?! You too?! Oh, no! That could only mean one thing! Everyone in the world has been turned into...
(He runs into the living room to find his mother and father as babies)
Dexter: Eep! Babies, babies, babies!
(He faints; Dee Dee leans in from the right)
Dee Dee: Dexter, what's the matter?
(She looks at Mom and Dad)
Dee Dee: Oh, my golly! They're so cute!
(She gives the infants a hug)
Dexter: I cannot believe that Mom and Dad are babies. What a mess I made. But wait, we are still older than they are! Maybe I can still catch the flick.
Dee Dee: Dexter, you're not leaving me to take care of Mom and Dad! This is your fault! You're not going anywhere until the Acceler-Ager is fixed! Now you get back into that laboratory and fix, fix, fix!
Dexter: But I want to help take care of the babies too.
Dee Dee: Nonsense. Boys don't know how to take care of children.
Dexter: Yes, we do. Watch. Let me hold Mom.
Dee Dee: Well, okay, here.
(She passes Mom to Dexter, but ends up sliding out of her hands; Mom starts crying; Dee Dee looks at Dexter angrily)
Dexter:*nervous chuckle* I'm gonna fix the thing.
(He bolts off to the right; later, Dee Dee is tending to Mom while she still cries)
Dee Dee: Aw, there, there. Baby want her bottle? That's better.
(Dad walks in)
Dee Dee: Hi, Dad.
(Dad hits Mom, knocking the bottle out of her mouth; Mom resumes crying)
Dee Dee: Aw, don't cry. Here's your pacifier.
(She sticks the pacifier inside Mom's mouth)
Dee Dee: That's better. Dad, you come here and apologize to Mom right now!
(Dad walks in with a sad look on his face)
Dee Dee: Well?
(Dad hits Mom again)
Dee Dee: Dad, stop being a stinker!
(She sniffs the air and makes a wrinkled face)
Dee Dee: Ew, speaking of stinky...
(She lays Dad down)
Dee Dee: Time to change your diaper.
(She pulls off the smelly diaper and drops it on the floor; Dad is seen laying on the floor; Dee Dee is seen putting the diaper back together)
Dee Dee: That's better. Now a little powder...
(She coats Dad in baby powder; he coughs)
Dee Dee: All done. I think it's time for nappy-bye. *A melody starts playing, she sings to it* ♫Go to sleep. Go to sleep. Go to sleep, Mommy and Daddy. Go to sleep. Go to-...♫
(She starts snoring; in the lab, Dexter is seen working on the Acceler-Ager)
Dexter: Work, and work, and work. That's all I ever do. While she just plays with the kids all day, what a world!
(At the entrance; Mom and Dad enter the lab; Dad eyes a machine; Mom is shown riding on a conveyer belt, she claps and laughs in excitement; two water jets spray her, and she starts crying; a claw picks Mom up and a metal hand spanks her; two plungers extend her head, and a small hex drill spins her whole body around; Dad is shown at the control panel messing with the buttons and the lever; a dazed Mom lands in the trash can; Dad walks over to and hits her)
(In the living room; Dee Dee is sleeping on the couch; she suddenly wakes up)
Dee Dee: Babies? Babies? Babies?!
(She goes and looks for them)
Dee Dee: Come out, come out, wherever you are!
(In the kitchen; Dee Dee looks in a cookie jar, and then inside a cookbook)
Dee Dee: Dad, where are you? Mom?
(She places her hands on her head with worry; back in the lab, Dexter is seen finishing the bolt; sweat is pouring down his head)
Dexter: One more should do it.
(He struggles, and his successful)
Dexter: All fixed.
(Dee Dee barges into the lab)
Dee Dee: Dexter, I lost Mom and Dad!
Dexter: You lost the babies? *He hits Dee Dee with the wrench* You lunkhead, can't you do anything right? Well, don't just stand there, help me find them!
(A map of the house is shown; Dexter is seen crossing out "Parent's Room")
Dexter: Well, we have systematically checked every place in the house except... my bedroom!
(He and Dee Dee run to Dexter's bedroom to find Mom and Dad on the bed sleeping together)
Dexter & Dee Dee: Aw... Shh!
(They sneak into the lab and activate the Acceler-Ager; everything is reversed; back in the bedroom; Dad wakes up)
Dad: Ah, what a good night's sleep! I feel great! What say we get a babysitter and go see a movie tonight?
(Pull back to show Mom with messy hair, bloodshot eyes, and baggy eyelids)