'Avengers: Endgame' was the final appearance in the Marvel Cinematic Universe for Downey Jr.'s Iron Man and Chris Evans' Captain America. But in a new interview, Tony Stark himself says it was the right time for both characters to retire. Robert Downey Jr., via 'Disney twenty-three' Robert Downey Jr., via 'Disney twenty-three' Disney honored Downey Jr. this past weekend at the D23 expo for his work in helping start the MCU. Marvel Studios is now heading into "Phase 4," which will center around the introduction of many new characters. The next slate of films include a 'Doctor Strange' sequel and 'Thor: Love and Thunder.'