Mr. Barkin's driving a bus with the MHS-cheerleading squad (with Ron and Rufus in tow) to an invitational cheerleading competition, 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 [[IDontLikeTheSoundOfThatPlace Wannaweep]]."

The bus then hits a nail board, flattening two of the tires and forcing it to a 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 ultimately defeat Gill, who is handed over to Dr. Lurkin, a scientist who might be able to cure him in the hopes of returning him to normal. As they're getting ready to leave, Mr. Barkin and the cheerleaders thank Ron for saving them (including Bonnie, who grudgingly acknowledges that Ron was very brave in his defeat of Gil) and Kim thanks Ron too, as well as adding how proud she is of him for what he and Rufus did to save them.

However, upon Ron questioning her about it, Kim admits that it's "ferociously unlikely" that she'll actually let him lead their next mission.

!!This episode provides examples of:
* AllUpToYou: Gil ends up traping Mr. Barkin and all the cheerleaders (including Kim), ultimately leaving it up to Ron and Rufus to capture Gil and save the day.
* CellPhonesAreUseless: The squad's cell phones don't get any service and even the Kimmunicator doesn't work. Justified as Gill used equipment from the Telecommunicatons Camp to jam their signals.
* ChekhovsGunman: At first, Ron's flashback with Gil just seemed like another random story, until we find out what the creature hunting him and 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}}) "and then, the woodpeckers came."
* GreenEyedMonster: Gil's dislike/hatred towards Ron seems to stem from how, aside from all the hero-stuff that he and Kim do together, he ultimately got to have a much more "normal" life--Gil, on the other hand, ended up becoming a mutant (possibly permanently).
* HandGagging: Gill does this to Barkin before dragging him into a bush as he abducts him.
* IndestructibleEdible: While hiding out in Ron's old cabin, it's revealed that his secret stash of snacks are still there. Kim and Bonnie find the idea of eating them gross, but Ron points out that they have enough preservatives to last for decades.
* KidsAreCruel: According to Ron they are, anyway.
--> '''Ron:''' Ah Bonnie, you remind me of the mean kids at camp. Sticks and stones.
--> '''Tara:''' ''(gasps)'' They called you names?
--> '''Ron: ''' Yes, as they were hitting me with sticks and stones.
* LaughOfLove: Tara giggles before kissing Ron on the cheek at the end of the episode.
* 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.
* NamesToRunAwayFromReallyFast: Camp ''Wannaweep''.
* NeverMyFault: Gill blames Ron for him being a mutant, but he was the one who willingly swam in the polluted water, even though Ron told him it seemed funny, so Gil really has nobody but himself to blame (and, maybe to a certain extent, the nearby science camp).
* ObliviousToLove: Tara's nicer to Ron than the other cheerleaders (especially Bonnie), but Ron's a little too busy freaking out over being back at Camp Wannaweep (and being hunted down by Gil) to notice.
* ProperlyParanoid: As shown, Ron's fears about Camp Wannaweep are more than justified, especially about swimming in the lake.
* ScienceIsBad: Gill thinks so, as the toxic runoff from the science camp[[note]]Not band or clown camp[[/note]] made him into a mutant.
* ShipTease: At the end of episode, Tara kisses Ron on the cheek for saving her and the rest of cheerleaders.
* SkewedPriorities: Even with them being stranded in an abandoned summer camp and being hunted down by a mutant fish-monster, Bonnie was more concerned about missing the cheerleading competition they had supposedly been invited to. While hiding out in Cabin 13, she points out that they're now short two cheerleaders and with no one to drive them to it--a cheerleader named Crystal tells Bonnie, "Forget the competition! How are we gonna survive the night?! Seriously, there's something out there!" Bonnie then says, "Okay, okay, you're right." ''({{Beat}})'' "[[DramaticallyMissingThePoint Do you think that something can drive?]]" Even when Mr. Barkin and the cheerleaders were in danger of becoming mutants, Bonnie screamd, "There's no way they're going to let a squad of mutant cheerleaders into the competition!"
* SlasherMovie: AffectionateParody of the "there's a stalker at a 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!]]