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"Brother from Another Series" is the sixteenth episode of The Simpsons ' eighth season and originally aired February 23, 1997. Sideshow Bob is released from prison into the care of his brother Cecil and claims to be a changed man. However, Bart does not believe him and tries to find out what Bob is up to. It was the first episode directed by Pete Michels and was written by Ken Keeler. Guest starring Kelsey Grammer in his sixth appearance as Sideshow Bob and David Hyde Pierce as Cecil. The title is not only a pun on the movie The Brother from Another Planet (This has appeared previously), but also a reference to the fact that guest stars Kelsey Grammer (Frasier Crane) and David Hyde Pierce (Niles Crane) also play bickering brothers on the sitcom Frasier.

Former criminal Sideshow Bob is declared a changed man by Reverend Lovejoy and released from prison, despite the protests of Bart. Bob is released into the care of his brother Cecil, who is Springfield's chief hydrological and hydrodynamical engineer. The two had previously not spoken for ten years. A flashback reveals the cause of this rift: Cecil had auditioned to become the new sidekick for Krusty the Clown, a job he had long desired, but Bob was chosen instead. Cecil and Bob plan to build a dam in a river near Springfield, while Bart, believing that Bob is still evil, continuously follows him around. Bob begins to become upset over Bart's investigations and his incompetent employees (Cletus and his family) and expresses a desire to see the dam blow up and obliterate Springfield.

Meanwhile, Bart enlists Lisa to help find out what Sideshow Bob is up to, and their repeated efforts are a constant source of annoyance to Bob. Even after Bob angrily escorts them home and expresses a deep disappointment with Marge and Homer that they have far too little watch on them, they decide to go to Bob's trailer at the dam construction site and discover a briefcase full of money, evidently stolen from the dam construction funds. They are soon discovered by Bob and the children run away and hide inside the dam's turbine room, but are cornered. When confronted with the money, Bob denies knowing anything about it. Cecil shows up and reveals that he is the one who embezzled the money by cutting back on construction; now he plans on framing Bob and using him as a scapegoat when the poorly-constructed dam collapses. He locks Bob, Bart and Lisa in the dam and prepares to blow it up, taking the money with him (which he declares is to be officially recognized as his reasons for framing Bob, though he privately admits his motivation is over the Krusty's assistant incident).

Deciding to work together, Bart, Lisa, and Bob escape and they try to save the dam. Bart jumps at Cecil; Cecil attempts to swat him off with the briefcase of money, but the case bursts open and the money is lost. Cecil throws Bart off the dam, hoping to do what Bob never could, which is to kill Bart, however crudely ("If anyone asks [how I killed Bart], I'll lie!"), whereupon Bob grabs Cecil's dynamite and cord and dives down in an effort to save him. He manages to save Bart and the town by cutting the cord on the dynamite. The police arrive and Cecil is immediately arrested. Bob gloats over his victory and finally wins over Bart and Lisa's respect, but Chief Wiggum suddenly arrives and arrests Bob, believing him to be involved in the plot as well, despite Bart and Lisa's protests. As they are taken away, Cecil tricks Bob into swearing revenge on Bart and Springfield again, much to Bart's shock. Upon realizing that he has promptly made Bart his enemy and destroyed his reputation with Springfield again, Bob gets angry at Cecil for making him look crazy. Just after the arguing brothers are taken away, the dam crumbles and releases a torrent of water on Springfield, only to do apparently minimal damage.

Cecil Terwilliger has not been a contender in any CBUB matches.