Heath Ledger wasn't the only person who was considered for the role of the Clown Prince of Crime, the Jester of Genocide, the Harlequin of Hate, or the Ace of Knaves, a.k.a. the Joker, but he was Christopher Nolan's number one pick for the role way back when Ledger was auditioning for Bruce Wayne/Batman in Batman Begins...yes that's right, Heath Ledger could've been Batman.
You'll find that most of these actors are comedians, and with that thought in mind, it would've been very hard to see some of these guys take over the green hair and purple suit, master a laugh, and do some quite evil things as the Joker sometimes does. But that's just me.
Below are the 8 actors who could've been the Joker!