Lenny is the junior manager of the Frosty Mart, His real name is Leonard. He finds Fanboy and Chum Chum irritating he sometimes calls them weirdos or costumed goofballs. He sometimes gets a "stress twich" when annoyed by Fanboy and Chum Chum. His first appearance was in "Dollar Day". Lenny is the second main antagonist of the show. He has a cat and lost 3 toes in "Refill Madness". Voiced by Wyatt Cenac. In the pilot from Random! Cartoon, he was voiced by Dan Castellaneta.
Source from: Wikipedia.com