The episode begins with Gary looking for his cat outside his house, unaware of an unknown creature that lurks near him. Just as he finds his cat, he is snatched by the creature under his car.
The next morning, the Wattersons are eating in the living room where they see a TV news report about the disappearance of local citizens. The news report shocks them but motivates Gumball and Darwin to investigate and find out who the culprit is. During the investigation, Darwin finds a mysterious egg under Gary's car, which they take to Anais for further examination. However, the brothers get bored of listening to her so they resume their search for clues. Fortunately, they find pieces of shredded clothes which lead to Gary's basement.
Meanwhile, Anais finds out that the egg comes from a "Trionyx," the same species as their Evil Turtle. Much to her horror, the egg hatches and the hatchling attacks her, alerting Gumball and Darwin who come to her rescue. Once the danger passes, Anais reveals that the Evil Turtle is actually female and has escaped while being pregnant.
After Nicole and Richard are informed of this, the family investigates Gary's basement, where Nicole sees a whole breeding ground filled with Evil Turtle's eggs as well as the missing locals. Just as Nicole gets them out, the eggs begin to hatch. The countless hatchlings spread all over Elmore, wrecking havoc everywhere they go.
Anais then finds out that the hatchlings will take over any territory they can unless they have their mother to guide them, so the only way to stop the hatchlings from destroying Elmore is to find Evil Turtle so she can lead her offsprings to the river. The family finds Evil Turtle captured in Pest Controller's van and show her to her offsprings. The plan works, Gumball says goodbye to Evil Turtle and apologizes for never understanding her. The family observes Evil Turtle swimming away with her babies in awe, with Gumball revealing that their pet was never really evil, but simply a caring parent. However, the turtles attack and sink a nearby ship, much to the family's shock and Anais speculates that maybe she was both caring and evil.
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[The scene starts with Gary on his front porch]
Gary: Here, kitty, kitty, kitty.
[He starts walking on to the sidewalk]
Gary: Kitty? Where are you? Kitty, kiiiity, kitty?
Nicole: [puts hand on Richard's mouth]
Gary: [gasps] Kitty! I can hear you under there you little rascal. Come on.
Gary: Ha! There you are!
Kitty: [Meows Angrily]
Gary: Wait, If you're there, Then what's...?
[screams] Oh man! Oh no! Help me! Ah Ah Ahhhhh!
The Neighbor's Disappearance
Gumball: Meh. I had a really weird dream last night. I asked Penny if she can marry me and she was all like, "[screams] Oh man! Oh no! Help me! Ah Ah Ahhhhh! Woowoowoowoowoo! I took it as a yes.
News Reporter: We interrupt this cartoon with some breaking news. Elmore police are investigating the disappearance of several citizens. Who's to blame? Feral Teenagers? Foreigners? The Internet? We don't have all the evidence, but it's never too early for a verdict, so we say yes.
News Reporter: Yes!
News Reporter: and YES!! [bangs his fists on the table]
News Reporter: Here is one of the alleged victims.
Richard: Ah. It's okay. We don't know him.
News Reporter: This photo is several years old, [added curved lines on Gary's Forehead] but this is what he may look like now.
All: [gasps] It's the guy next door!
[French Fry cop puts up a missing poster]
Gumball: [dramatically] Oh, how could this have happened to you, dear Mr...
Darwin: Guy...? I have no idea what he's called.
Gumball: Me neither.
Darwin: And to think we live right next door to him.
Gumball: We gotta help find him.
Darwin: Yes! Because we refuse to let you go without a fight. Oh dear Mister... Uh... Uh... Sorry I thought it would come. [walks away], [comes back]. We might need this. [grabs the poster].
Gumball: You don't just disappear like that without leaving some kind of evidence. Hmm... Must be something.
[trash can rattles]
[cat scratches Gumball and screams]
Gumball: And that is why I'm not a cat person.
Darwin: Uh... [points to Gumball's face]
Darwin: Nothing. Oh, wait up. Uh, you might wanna take a look at this.
[looks at the egg]
Both: [imitating dramatic music]
Investigating The Egg
Anais: [looks at the egg with a magnifying glass] Hmm... I'm not exactly sure, but I'm certain I've seen something in this book. It's an egg, so it's obvious it's not a mammalian, but it's got a leathery surface, I rule out Avian. Aha! Then it must be reptilian. But let's not get ahead of ourselves here, I need to study the cold-blooded facts. [chuckles] get it? [chuckles] cold-blooded? [chuckles] you missed that. [chuckles, then sighs]
Darwin: Didn't you wanna hear what she thought?
Gumball: Neh. She lost me at a book. Let's just keep looking for clues.
Darwin: Maybe this obvious trail of shredded clothing is a clue.
[dramatic music plays]
Gumball: Nah. If it was, it would be more dramatic than that.
[starts thundering and raining and cat meows]
Gumball: [screams] Okay, okay, okay! It's a clue, it's a clue!
[Nicole and Richard Watching the news]
News Reporter: The number of mysterious disappearances continues to rise. Elmore police have made the following statement.
Doughnut Sheriff: We are doing everything in our power to find the missing citizen. There will be no stone unturned.
[Hamburger Cop turns stone to see nothing there and shakes her head slowly]
Darwin: Wait. So the clothes lead right back to our own house?
Gumball: This could only mean one thing.
Darwin: Whoever's in there is naked.
Anais: Okay. Reptiles, it's gotta be in here somewhere. Snake? No. Crocodile? No. Banker? No. Oh, what could it be?
Anais: [gasps] Trionyx. An Aggressive predator from the Nile River. Hey, that's the same as our turtle. Eggs will only hatch in a warm environment. [gasps and looks at the shell, hears rattling and hissing, holds out something] Ya!
[something scratches Anais]
Anais: Ow! [screams]
Gumball and Darwin: Anais!
[They climb up the basement and see the turtle trying to bite Anais]
Gumball: Hold On! [grabs a tennis racket] Hey, you, say hello to my little friend... Darwin.
[The turtle tries to bite Darwin. Darwin screams.]
Anais: Gumball, distract it!
[Gumball dances, distracting the turtle. Anais hits the turtle with a book, sending it flying through a wall and out of the house.]
Gumball: What was that thing?
Anais: That was out Evil Turtle's baby.
Gumball and Darwin:[gasps]
Anais: Which means our evil turtle was a girl.
Anais: And she wasn't really evil.
Anais: She was just pregnant.
Anais: And I think she-
Gumball: Wait. One more shocking revelation and we might explode.
Gumball: Please continue.
Anais: She must have escaped.
Gumball: But how? We blocked the top of the tank.
Anais: She must've chewed her way down.
Gumball: [moves the books] I think we have a little problem.
Anais: I think it's a big one. It says in this book, it will grow according to how much food is available. So imagine what she could become an american suburb?
Gumball and Darwin: Supersized.
[Nicole and Richard still watching the news.]
Newscaster: Breaking news. The monster has been caught...
Nicole and Richard: [Sighs]
Newscaster: On camera eating an old man walking his dog.
[They both get scared again, and the kids call out to them.]
Richard: Shh! Kids please.
[On the TV, it shows Marvin being eaten by the evil turtle. Marvin screams and the camera gets up closer to him.]