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 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 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 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 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's handed over to a scientist named Dr. Lurkin, who might be able to cure him in the hopes of returning him back to normal. As they're getting ready to leave the camp, Mr. Barkin and the cheerleaders thank Ron for saving them—even Bonnie (very grudgingly) acknowledges that what Ron did was very heroic and that it was very brave of him to save them all. Kim, of course, thanks Ron for saving her and the rest of the cheerleaders and adds how proud she is of him for what he and Rufus did to save them.
However, after Ron questions her about, Kim admits that it's "ferociously unlikely" that she'll actually let him lead their next mission.
This episode provides examples of:
- All Up to You: 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.
- Cassandra Truth: Officer Hobble disbelieves that Ron was the one to save the day instead of Kim this time.
- Cell Phones Are Useless: 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.
- Chekhov's Gunman: At first, Ron's flashback with Gil just seemed like another random story, until we find out what (or who) the creature hunting him and the squad is.
- Chekhov's Skill: Taking that arts & crafts class and making lanyards really worked out for Ron.
- Dwindling Party: A non-fatal example.
- Everything Trying to Kill You: 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.
- Fish People: Gill has become this as a result of his contact with the lakewater.
- Flashback Cut: Many to Ron's times at Wannaweep.
- From Bad to Worse: "There I was, trapped in the hollow of a tree (gasps)" (Beat) "and then, the woodpeckers came."
- Green-Eyed Monster: Gil's dislike/hatred towards Ron seems to stem from how Ron ultimately got to have a much more "normal" life compared to Gil, who ended up becoming a mutant (possibly permanently).
- Hand Gagging: Gill does this to Barkin before dragging him into a bush as he abducts him.
- Indestructible Edible: 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.
- Kids Are Cruel: 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?
- Laugh of Love: Tara giggles before kissing Ron on the cheek at the end of the episode.
- Lured into a Trap: 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.
- Names to Run Away from Really Fast: Camp Wannaweep.
- Never My Fault: 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).
- Oblivious to Love: 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.
- Properly Paranoid: As shown, Ron's fears about Camp Wannaweep are more than justified, especially about swimming in the lake.
- Science Is Bad: Gill thinks so, as the toxic runoff from the science campnote made him into a mutant.
- Ship Tease: At the end of the episode, Tara kisses Ron on the cheek for saving her and the rest of the cheerleaders.
- Skewed Priorities: Even with them being stranded in an abandoned summer camp and being hunted by an unknown monstrous creature, Bonnie was ultimately more concerned about her and the rest of the squad missing the cheerleading competition they had supposedly been invited to compete in. It's not until after Gil finally shouts that there was no cheerleading competition and that the whole was a setup by him to get revenge on Ron that Bonnie (presumably) gets it.
- Slasher Movie: Affectionate Parody of the "there's a stalker at a summer camp" kind.
- Smooch of Victory: Tara gives one to Ron (albeit on the cheek) after everything is wrapped up.
- Something Only They Would Say: Downplayed. Ron initially doesn't recognize the fish mutant before him when it calls him "squeeb". But after the creature recollects a time they traded activities, Ron recognizes who it used to be:Ron: Gil?
- Summer Campy: Ron has very bad memories of Camp Wannaweep
- That Man Is Dead: Played for Laughs; "I am no longer 'Gil', now I am "Gill!"Ron: What's the difference?Gill: I added an "L", you know, as in "gill." As in, THESE THINGS I GREW WHEN I MUTATED!