Lem is a character who first appeared in Halloween of Horror.
After getting fired by Apu, due to Homer revealing the deal they made with him, Lem and his friends plotted revenge on Homer. However, their revenge wasn't successful and Lem and his friends were arrested.
- After being arrested, Chief Wiggum told them when they get out to look him up, as he knows someone that owns a 99 cent store. This implies that Lem and his friends will be permanent residents in Springfield.