Don Cheadle: 'Iron Man 3 Will Be Existential'
Star promises a change of tone in forthcoming threequel...
He told E! News: "The tone is there's more of an existential journey that Tony's on trying to come to grips with this thing that he created that is creating him too.
"Who's really in control? And the toll that it takes on his relationships. And then a lot of s**t blows up!"
The threequel also features Guy Pearce as Aldrich Killian and Rebecca Hall as Dr Maya Hansen - along with the return of Gwyneth Paltrow as Pepper Potts and Jon Favreau as Happy Hogan.
It is set for release on 26 April in the UK.
Downey Jr. has previously stated that the movie will not be 'predictable'.