Director CHRISTOPHER NOLAN, MICHAEL CAINE and CHRISTIAN BALE on the set of 'The Dark Knight'

The British star of both Batman Begins and The Dark Knight has let it slip that his movie boss' next foe will "probably be The Riddler" - a role made famous on screen by Jim Carrey in 1995's Batman Forever and on TV by Frank Gorshin, who died in 2005.

Johnny Depp and Eddie Murphy are both in the frame for the role, according to Hollywood gossips.

Caine has no idea who will be cast, but is hoping for a performance to rival Heath Ledger's Oscar-winning portrayal of The Joker in The Dark Knight.

Caine tells People.com, "I thought it (The Joker character) was going to be a tough job for anyone who played the role after Jack Nicholson (in 1989's Batman). Now Heath is the Joker."

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Source: WENN