[Jimmy and his parents show up in the backyard of Uncle Newt and Aunt Kari's house to celebrate Aunt Amanda's birthday with the other Neutrons]
[carrying her birthday present] Happy Birthday, Great Aunt Amanda! You're looking more beautiful and less wrinkly every year.
AAunt Amanda
No thanks to you, young man, your gadgets and gewgaws have taken ten years off my life!
But, Aunt Amanda, how can you say that? Jimmy's gadgets have saved the town dozens of times.
KAunt Kari
Sure. After he brought down a giant meteor to destroy us all.
NUncle Newt
Or those evil rotting aliens.
CACousin Annabelle
OR PANTS! HORRIBLE WALKING PANTS!
CGCousin Gomer
Which cousin are you again?
Now, now, now. Newt, Kari, Cousin Gomer, Cousin Annabelle… [Baby Eddie babbles] and little Eddie, let's not fight. We've gathered together because we love our dear Aunt Amanda and not because her fabulous wealth controls our very destiny.
Yeah, can't we all just get along and be a family?
AAunt Amanda
NO! Because of you, the Neutron name isn't respectable anymore. Why can't you be nice like your two young friends?
James Isaac Neutron! What were you thinking?
Nothing! I mean, it must have been sunspots!
AAunt Amanda
You're a menace! That's what you are, young man! [the other adult Neutrons agree]
Jimbo, get inside the house and stay there before Aunt Amanda writes us all out of the will!
[sharply] No buts, mister! March!
[Jimmy sadly obeys]
AAunt Amanda
And take that horrible (robotic) dog with you! [Goddard growls and follows Jimmy inside the house]
[Later, inside the house…]
Hey, Jimmy, are you okay?
Cheer up, Jimmy. We brought you some of Aunt Kari's world-famous, migraine-inducing desserts.
Guys, we have a situation. There's no reason those presents should have exploded. Someone bombarded the spatula with delta waves. Only a genius could come up with a plan like that. And the delta waves came from the backyard. Do you realize what that means?
Uh, Jimmy, do you mind if we just keep eating?
It means that there's another genius in my family besides me. An evil genius.
That's horrible! Hey, Sheen, are you gonna finish that death-by gelato?
Goddard, isolate the Neutron genius gene. Now, compare the gene against DNA profiles of all adult family members. Hmm. The two most likely suspects would be… Cousin Gomer or Cousin Annabelle.
Okay, so what you're saying is that one of them must only be acting dumb.
We gotta find out which one before they make another attempt on my family's lives!
Right. To the buffet! What? I'm still hungry.
[sneaks past the family and places the battery in the birthday candle] Zappa du ba-ba, zappa du ba-ba, Zap, Zap, Zappity bo-ba!
All right, it's time for Aunt Amanda's birthday cake, everyone. Come on! [the family heads to the cake; Hugh places the candle holder on top of the cake]
NFNeutron Family
[singing] Happy birthday, happy birthday, happy birthday, happy birthday, happy birthday! [suddenly Baby Eddie zaps the battery in the cake, much to the family's horror]
[races outside the house riding on Goddard in his Flycyle mode] GET DOWN, EVERYONE! [the adult Neutrons duck for cover as Jimmy removes the bomb and throws it into the sky, where Goddard blows it up with lasers before making a landing, while Jimmy goes face-to-face with Baby Eddie] Too bad you didn't know about Goddard's backup battery. It's all over, Eddie! Oh, you're going down, baby. [he and Baby Eddie have a brawl and the adult Neutrons shriek, then Jimmy launches Eddie who hits a picnic table, sending party hats and presents flying everywhere and catapulting the birthday cake, which lands on Aunt Amanda's head]
All right, all right, all right, break it up now. Jimbo, we told you to stay in the house!
AAunt Amanda
This is the child you raised?! A vicious, rotten baby mauler?!
It's not what you think, Aunt Amanda! Eddie's an evil genius! He was trying to blow everyone up so he could get your fortune!
He takes after her side of the family! [points at Judy]
He may be adopted. It looks nothing like me.
[A high-pitched whirring sound is heard]
KAunt Kari
Wait. There's that horrible noise again!
I know, Aunt Kari. I reset Eddie's rattle during our struggle. It's programmed to overload.
[The sound is shown coming from Baby Eddie's rattle]
Oh, poopy! [throws his rattle into the air and it explodes] You broke my rattle! You dweeby, no-good, pointy-headed, weasel-faced freak! [The adult Neutrons are shocked as he accidentally reveals his true colors while Jimmy grins smugly] Uh, I mean… [in baby voice] Goo?
AAunt Amanda
That baby's a bad seed! [to Jimmy] It's Jimmy who's the good nephew!
[The adult Neutrons cheer for Jimmy and forgive him as Sheen, Carl, and Cousin Gomer exit the house]
KAunt Kari
I'm so sorry little Eddie tried to destroy us all.
If I were you Aunt Kari, I'd keep him on a baby leash.
Oh, no, not the leash! I'll get you for this, Cousin Jimmy, you hear me?! This ain't finished, not by a long shot! Hey, where's my juicy cup? Where is the cup that I can spill without spilling?
Dad, our family is very weird.
It sure is, son. It sure is.