The cheerleader squad is on a bus (driven by Mr. Barkin) to an event, when Ron suddenly becomes agitated at the sight of a "too familiar" place. He becomes even more upset when Kim shows him their current location on the Kimmunicator, announcing that it's his "worst nightmare -- return to Camp Wannaweep".

The bus then hits a nail board, flattening the tires and forcing it to stop. Everyone takes shelter in the abandoned campground, while Ron recounts [[SummerCampy the awful summer he spent there as a child]]. Among other things, he was bullied by another camper named Gil, who spent most of his time swimming in the lake (which Ron avoided because it looked and smelled dubious).

Meanwhile, a [[FishPeople creature resembling a giant humanoid frog]] is lurking and watching, finally moving in to attack. It turns out to be Gil, mutated by the polluted water of Camp Wannaweep and determined to get revenge on [[NeverMyFault the one he blames]] for his condition: Ron Stoppable.

Ron uses his knowledge of the camp and his excellent lanyard making skills to defeat Gill, who is handed over to Dr. Lurkin, a scientist who might be able to cure him in hopes of being cured. Kim tells Ron she is impressed by his skills, but when he asks if he can be in charge on the next mission, she admits that is "ferociously unlikely."

!!This episode provides examples of:
* AllUpToYou: Gil traps Kim, Mr. Barkin, and the cheerleaders with his slime, leaving it up to Ron and Rufus to capture him and save the day.
* ChekhovsGunman: At first, Ron's flashback with Gil seemed like another random story, until we find out what the creature hunting the squad is.
* ChekhovsSkill: Taking that arts & crafts class and making lanyards really worked out for Ron.
* DwindlingParty: A non-fatal example.
* EverythingTryingToKillYou: Or at least, Ron thought so; even the squirrels were apparently vicious.
--> '''Kim:''' Ron, I think we've established the squirrels mean us no harm.
* FishPeople: Gill.
* FlashbackCut: Many to Ron's times at Wannaweep.
* FromBadToWorse: "There I was, trapped in the hollow of a tree (gasps)" (beat) "then, the woodpeckers came."
* GreenEyedMonster: Gill's primary dislike of Ron seems to be based on how he went on to become the sidekick to a world famous teen hero, while he ended up becoming a mutant.
* LuredIntoATrap: Gill went to great lengths to bring Ron and the cheer squad into his clutches, from causing a blowout of the bus's tires and jamming all communications to even sending out an invite to a phony cheer competition.
* KidsAreCruel: According to Ron they are, anyway.
--> '''Ron:''' Ah Bonnie, you remind me of the mean kids at camp. Sticks & stones.
--> '''Tara:''' ''(gasps)'' They called you names?
--> '''Ron: ''' Yes, as they were hitting me with sticks & stones.
* NamesToRunAwayFromReallyFast: Camp ''Wannaweep''.
* NeverMyFault: Gill blames Ron for him being a mutant, but he was the one who swam in the polluted water, even though Ron told him it seemed funny, so he only has himself (and science camp) to blame.
* ObliviousToLove: Tara is nicer to Ron than the other cheerleaders. But Ron's a little too busy freaking out over being back at Camp Wannaweep (and being hunted down by Gill) to notice.
* OutOfOrder: Although this was the second episode aired, chronologically it takes place prior to [[Recap/KimPossibleS1E9AttackOfTheKillerBebes ''Attack of the Killer Bebes'']] as Ron didn't become the Middleton Mad Dog until that episode.
* ScienceIsBad: Gill thinks so, as the toxic runoff from the science camp [[note]] Not band camp or clown camp [[/note]] made him into a mutant.
* ShipTease: At the end of episode, Tara kiss Ron on the cheek.
* SkewedPriorities: Even with them being stranded in an abandoned camp and being hunted by a mutant fish monster, Bonnie was more concerned about missing the cheerleading competition they had supposedly been invited to. Even when she and the other cheerleaders were in danger of becoming mutants, she was more worried about the judges disqualifying them for being mutants.
* SlasherMovie: AffectionateParody of the "there's a stalker at summer camp" kind.
* SmoochOfVictory: Tara gives one to Ron (albeit on the cheek) after everything is wrapped up.
* SummerCampy: Ron has ''very'' bad memories of Camp Wannaweep
* ThatManIsDead: PlayedForLaughs; "I am no longer 'Gil', now I am "Gill!"
--> '''Ron:''' What's the difference?
--> '''Gill:''' I added an extra "L", you know, as in "gill." As in, [[SuddenlyShouting THESE THINGS THAT GREW WHEN I MUTATED!]]