Kim & Ron are volunteering at the Middleton Medical Center as "sunshine spreaders" and Ron is given the task of attempting to cheer up Timothy North, a reclusive cranky old man. Eagerly taking on the challenge, Ron visits North's mansion, where, in the course off helping him, stumbles upon a hidden underground cave and learns North was once a hero named the Fearless Ferret. Ron offers to take on the Ferret mantle for himself and a reluctant North agrees. With Rufus as his sidekick, "Wonder Weasel", Ron manages to stop a pair of carjackers and attract the attention of several bystanders one of which appears to know and hate him.

Kim, meanwhile, worries about Ron and follows him to an old warehouse, where he is set upon by the aforementioned bystander, a skunk themed villain named White Stripe. With Kim's help, Ron overcomes the villain, but his attempts to preserve his identity fail, as she easily recognizes him. Following him back to the Ferret Hole, Kim is soon forced takes him along to investigate a series of robberies of smelly items. While Ron is out on patrol, Kim sits down to watch a new cable channel, ''TV Trash Heap'' and learns that "the Fearless Ferret" was just an old TV show and that North really believed it happened. Fearing for Ron's safety, Kim rushes to North's mansion and reveals the truth to him, only to learn Ron was captured while helping an old woman (actually White Stripe in disguise).

Ron & Rufus find themselves tied up atop the Tri-City Convention Center where the smelly villain plans to unleash a stink bomb on the "Ferret Fest" celebration that's going on. Kim & North soon arrive, the actor amazed to see all the tributes to his show, while Kim attempts to stop White Stripe. Unfortunately, she falls prey to the villain's "stink spray" so Ron, using her grappling gun, retrieves the balloon and send it out of the center. After seeing North, Stripe, actually actor Rupert Farnsworth, regains his sanity and they enjoy the appreciative crowd. Kim hugs Ron for saving the day, while the balloon floats away harmlessly, only to explode on a pair of [[AcceptableTargets TV Trash Heap execs]].

!!This episode contains examples of:
* AcceptableTargets: The only people affected by White Stripe's stink bomb are a pair of TV Trash Heap executives.
* AdamWesting: With the man himself.
* AddedAlliterativeAppeal: A number of examples, most notably "'Fearless Ferret foils fiendish foe'" [[LampshadeHanging That's a lot of F's"]] and [[CouchGag The Middleton High sign]] which reads "Sunshine Spreaders, Super Special Students."
* AllJustADream: The BatmanColdOpen where Ron imagines saving Kim from "brain frost" by performing brain surgery.
* AllUpToYou: With Kim unconscious, it's up to Ron to save the day, and he does, in Ferret style.
* CatchPhrase: "It's time to [[IncrediblyLamePun ferret out evil!]]
* ComicallyMissingThePoint:
--> '''Ron:''' Can't I just sit around and, you know, listen to you reminisce about the good old days?
--> '''North:''' Eat snowballs.
--> '''Ron:''' ''(to Rufus)'' Was that something he did in the good old days, or wanted me to do now?
* DramaticUnmask: Parodied, when Kim just rips Ron's mask off.
--> '''Ron:''' That is so not cool to do to a superhero!
* {{Faceship}}: Like his namesake, Franchise/{{Batman}}, Fearless Ferret has a flying vehicle...which Ron promptly crashes.
* TheGlomp: Kim gives one to Ron at the end after he saves the day.
--> '''Kim:''' Way to go hero!
* InsistentTerminology: The Ferret Hole isn't a cave, [[CaptainObvious it's a hole]].
* ShoutOut:
** The "Fearless Ferret" series is one big AffectionateParody of ''Series/{{Batman}}'', including a faithful reproduction of the opening sequence, the button under the bust activating the poles and many more. Another parallel is that Will Friedle [[CastingGag voices both]] Ron Stoppable (who takes up the Fearless Ferret mantle in this episode) and Terry [=McGinnis=] (who takes up the mantle of Batman in ''WesternAnimation/BatmanBeyond'').
** Ron paraphrases a quote from the ''Film/SpiderMan1'' movie with Tobey Maguire: "If somebody told you I was just an ordinary teenage sidekick, somebody lied." Earlier in the episode they reinact the "upside down unmasking" from said film, only without the kissing part.
** Some of the other shows on TV Trash Heap include [[Series/LaughIn Laugh Riot]] & [[Series/TheModSquad The Mod Quad]].
** The scene in the opening, where Ron unscrews people's heads to perform surgery is supposedly taken from Film/TheManWithTwoBrains.
** At one point, White Stripe [[Film/TheEmperorsNewGroove smashes a bust of Fearless Ferret with a mallet]].
* {{Thememobile}}: The Ferret Mobile, natch.