He first appeared in the comic strip adventure Mickey Mouse in Death Valley. Since then He and Pete have been causing trouble for Mickey and his friends since then in Mickey's earliest comic strip adventures. In a Donald Duck story by Carl Barks he appeared as Scrooge McDuck's lawyer but his appearance was different from in the Mickey Mouse Comics and he wasn't an evil villain in that story. Sylvester was later replaced by Eli Squinch who was later replaced by Weasel.