It's a long story but here goes, in the episode 'Krusty Gets Busted' (season 1, episode 12), Sideshow Bob frames Krusty for robbery. Bart and Lisa think this isn't right and go and investigate. Bart and Lisa present their evidence and Sideshow Bob gets sent to jail. Bart did most of the work so when Bob was freed from jail, he wanted to kill Bart Simpson because Bart locked him away.
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Ok this is what happened. Bart's Favorite Person Krusty the Clown was framed by Bob and Lisa helped Bart figure it all out. Krusty can't Read but the framee was reading a magazine. Krusty has an heart thing and The Framee heated up a burrito at the microwave where heart pacer's are not aloud to be near . Then Homer Simpson stepped on the Framee's Foot and Yelled You big Idiot(*I think.) Bart figured it all out when Bob invited him to talk on his show and Bart put all the pieces together. He then Told all the Children That Bob Framed Krusty and Krusty was Released. Then Bob swore to kill Bart someday or another.
As of Season 26, Sideshow Bob has appeared in (not counting the clip show, mentions or photos) 39 episodes.
03x21 - Black Widower
His name was Cecil Terwilliger and he was played by David Hyde Pierce who also plays the role of Frasier's brother, Niles, in the TV series 'Frasier' (Frasier is played by Kelsey Grammer who voices Sideshow Bob, hence the title of the episode 'Brother From Another Series'). He is another criminal that made a crime using a weak dam to kill his brother Side show Bob, Bart and Lisa. He was tring to kill Bob because he wanted to be Krusty's sidekick, but Bob got the audition.
Bart has stated he has two "mortal enemies" ... Sideshow Bob & Dr. Demento.Sideshow Bob (Robert Underdunk Terwilliger Jr.)The best known and Bart's arch enemy. He is self-proclaimed genius but how you can see Bob is really clever... but he always makes some mistake in his evil plans. And because Bart (sometimes aided by Lisa) foiled many of these plans, Bob wants to kill him. His favorite catchphrase is ,,Hello, Bart." And how can you know him? Sideshow Bob has a very long feet and curly, palm tree shaped red hair. Oh and Bob's arch enemy is except Bart... a rake! He has other nemesis ...The BulliesBart's most known enemy in the school is Nelson Muntz. Other bullies are Jimbo Jones, Kearney Zzyzwicz and Dolph Starbeam. They all are more older than Bart (but Nelson is in the same class as Bart). They bully all children in the school and Bart is often thrashed by them. Seymour SkinnerSkinner is principal of Springfield Elementary School (Bart's school) and Bart hates school. What to say? Moe SzyslakBart sometimes calls to Moe's tavern and asks for imaginary people (e.g. Al Coholic, Oliver Clothesoff...) and like this makes a mockery of him. Moe doesn't know who is calling but once Bart said his name is Jimbo Jones and Moe believed him.
If you mean the character's name... obviously it's Sideshow Bob since that's what everyone calls him.