While performing live from Springfield Prison,
Krusty the Clown encounters
Sideshow Bob. Bob talks about the crimes he has committed in the past, including
framing Krusty for armed robbery,
attempting to kill Selma Bouvier, and
attempting to kill Bart Simpson as revenge for Bart exposing Bob's framing of Krusty and foiling his plan to kill Selma. Bob is later declared a changed man by
Reverend Lovejoy and leaves prison on a
work-release program, despite Bart's insistence that Bob is still a homicidal maniac. Bob is taken into the care of his brother,
Cecil; they have not seen each other in ten years. Cecil is
Springfield's chief
hydrological and hydrodynamical engineer, and he employs Bob to supervise the construction of a
hydroelectric dam in a river near the town. Bart, believing Bob is still plotting his murder, follows Bob's every move. Bob — annoyed by Bart's intrusions and the dam's incompetent laborers, including
Cletus — expresses his desire to see the dam burst and obliterate Springfield. While searching Bob's trailer at the dam
construction site, Bart and
Lisa discover a briefcase full of cash. When confronted with the money, Bob denies knowing about it, stating the finances were used to put
concrete in the dam's walls. However, the walls turn out to be hollow and poorly constructed. Cecil arrives — pointing a gun at Bart, Lisa, and Bob — and reveals his own intention to
embezzle the money from the project, and his plans to
frame Bob as the
scapegoat when the dam collapses from shoddy construction. Cecil's motivation for the crime is being upstaged at his audition as Krusty's sidekick ten years prior by Bob, who was chosen as the clown's sidekick instead, despite Bob having no interest in the job. Cecil locks Bob, Bart and Lisa in the dam and prepares to blow it up, taking the money with him. Deciding to work together, Bart, Lisa, and Bob escape and try to save the dam. While Lisa and Bob defuse Cecil's
dynamite, Bart lunges at Cecil before he can press the plunger. Cecil attempts to swat him off with the briefcase, which falls open and scatters money over the river below, washing it away. Cecil throws Bart off a cliff, but Bob grabs the dynamite's cord and swoops down to save him. As the two dangle over the side of the dam, Bob cuts the cord on the dynamite to prevent Cecil from destroying the town. Bart and Bob plummet down the dam's wall, but a protruding pipe stops their fall. The police arrive and arrest Cecil. Bob gloats over his victory, having gained the respect of Bart and Lisa, but
Chief Wiggum believes Bob was complicit in the crime and arrests him. As they are taken away, Cecil tricks Bob into swearing revenge and incriminating himself. The dam then crumbles and releases a torrent of water on Springfield, but does only minimal damage. Cecil and Bob are put in a jail cell together, which leaves both men miserable. ==Production==