Don Cheadle: 'Iron Man 4 Could Happen'
Star says fans need to 'make enough noise' to get Marvel's attention...
Iron Man 3, contradicted co-star Gwyneth Paltrow's recent claim that [uuid=bf4a3133-3cbe-4a2d-a5e7-6cff424127aa]Robert Downey Jr. has previously suggested that he is likely to return as Iron Man in Avengers 2.