Bart and Milhouse are thrilled to hear that a film version of their favorite comic book, Radioactive Man, is coming soon. Rainier Wolfcastle, the star of the McBain films, is chosen to play Radioactive Man, and even more excitingly for the Springfield Elementary School children, the production moves to their town, after seeing a small poorly spelled ad in Variety magazine. A search is launched for a young actor to play Radioactive Man's sidekick Fallout Boy, and Bart auditions. Bart does well, but is rejected because he is an inch too short. Bart leaves and acquires high shoes and a vertical stripe suit (among other attempts to look taller), but by this point Milhouse has already taken the part, albeit reluctantly and his parents forced Milhouse to be an actor. Milhouse's parents immediately begin buying expenive stuff when Milhouse became an actor.
A despondent Bart is told by Lisa that he is still needed as a star's friend and confidant, and Bart eagerly accepts this new role. However, Milhouse finds his own job intolerable and disappears, right during the filming of the most expensive scene in the movie. The film is suspended while the townspeople search for Milhouse. Eventually Bart finds him in the treehouse, Bart tells Milhouse he'll be a hero, but Milhouse retorts that the real heroes are the people fighting heart disease and world hunger.
Bart scoffs at this, saying that those 'loser' real heroes aren't winning their fights, and to find heroes that actually accomplish something you have to turn to action movies. Despite this and encouragement from former child star Mickey Rooney, Milhouse gives up on his acting career. Mickey Rooney tried to take over as the new Fallout Boy; however, all production on the film is aborted, with the project going bankrupt, thanks to price gouging and other unscrupulous conduct by the people of Springfield (i.e. Mayor Quimby inventing new taxes on the fly to take every red cent they have). Mickey Rooney scold them for doing this. However, Mayor Quimby and the others refused to give the money back. The directors then return to Hollywood, "where people treat each other right."
The episode finished 51st in the ratings. It acquired a Nielsen rating of 9.5. It received positive reviews from critics. The authors of I Can't Believe It's a Bigger and Better Updated Unofficial Simpsons Guide said it reminded them of Tim Burton's "Batman" films, and that Milhouse was the perfect choice to play Fallout Boy.