In which films does joker appear?

Well, the 问题 is not clear at first place, c'oz "JOKER" is a character, not a person in real. The actor though {Heath Ledger} has performed in lots of movies, like my personal 最喜爱的 "The Patriot".

The 1966 蝙蝠侠 film, the 1989 蝙蝠侠 film, The Dark Knight, Suicide Squad, and several animated films.