Sideshow Bob appeared in Season 26's The Simpsons Guy & Blazed & Confused.
The Simpsons is currently on hiatus and will return with a new season in September 2015.
Season 26 began on November 02nd 2014
Season 29 began on October 01st 2017.
The New Kid on the Block, Season 4
The New Sideshow - 2002 TV was released on: USA: June 2002
Lionel Huts was the Springfield attorney who first appeared in the second season of the TV series The Simpsons. He was incompetent and always looking for a new case.
First of all, sideshow bob framed Krusty because Bob hated Krusty for when he gave Bob the receiving end of Krusty's humiliating gags. So if he framed Krusty and Krusty went to jail, he could become the new host and do to the show, what he wanted to do. But then Bart realizes that Bob framed Krusty and Bob is sent to jail swearing revenge on Bart Simpson (see season 1, episode 12 "Krusty gets busted").
Without knowing which character or in which episode they appeared, your question is hard to answer. If there was a new character in Season 21, most likely what happened to them is the same thing that happens to most of them. They were one shot characters and only existed in the Simpsons world for the one episode they appeared.
Without knowing when the question was originally written, it's hard to know exactly what you're referring to as The Simpsons airs new episode from September to May, & will do so through May 2019, its 30th season.
is there going to bo a new simpsons game
he said like many times since 1st season to today season. he said many different d'oh. Ike doome in The Simpsons Movie.
yes, in 1 of the new season 19 episodes they bring back Lurleen Lumpkin and she end up with the Dixie Chicks