Downey Jr. shared videos of the actors’ “costume swap” on. Halloween had no shortage of viral costumes, but Robert Downey Jr. and Pedro Pascal might have taken the crown by swapping places as Mister Fantastic and Doctor Doom. Doomsday on 17th December in India. The film will release in English, Hindi, Tamil and Telugu. LINK: Doctor Doom hijacked Halloween this year, bringing none other than Reed Richards along for.