How many movies have Robert Downey Jr. and Ross Marquand acted in together?

They have worked on 2 movies together! Their first movie together was Avengers: Infinity War (2018) while their highest rated movie together was Avengers: Endgame (2019). They have not worked together since Avengers: Endgame (2019).

Role
Tony Stark / Iron Man
Role
Johann Schmidt / Red Skull (Stonekeeper)
Role
Tony Stark / Iron Man
Role
Johann Schmidt / Red Skull (Stonekeeper)