Los Angeles, Nov. 1 -- Robert Downey Jr. and Pedro Pascal surprised Marvel fans with a playful costume swap, with the two actors sharing a video in which they trade the looks of their respective Marvel characters, Doctor Doom and Reed Richards.

In an Instagram post captioned, "Victor. Richard. Costume swap!", Downey is seen wearing the classic blue suit and white harness associated with the Fantastic Four's Reed Richards, complete with the iconic '4' insignia.

Pascal, meanwhile, sports a rugged green hoodie and cloak, referencing Downey's Doctor Doom character in the upcoming 'Avengers: Doomsday.'

The unexpected wardrobe exchange has generated considerable excitement among fans, with the video attracting millions of likes and prompting...