Speculation is mounting that Iron Man 4 could be in development, potentially marking Robert Downey Jr.’s return to the Marvel Cinematic Universe alongside Katherine Langford. While Marvel Studios has remained silent on the matter, industry insiders have suggested that the project—possibly titled Iron Man 4: Legacy—could explore Tony Stark’s lasting influence and the emergence of a new armored hero. Ever since Tony Stark’s sacrifice in Avengers: Endgame, fans have debated the possibility of his return. Some theories suggest an A.I. version of Stark, while others point to time-travel shenanigans. However, recent rumors hint that Iron Man 4 might focus on Stark’s daughter Morgan (Langford), who was briefly seen in Endgame’s deleted scenes as a teenage version of the character. Katherine Langford’s involvement has been a mystery ever since her Endgame scenes were cut, but Marvel Studios could be looking to reintroduce her as the rightful heir to Stark’s legacy. If true, Downey Jr.’s role might be that of a guiding force—perhaps as an A.I. mentor to Morgan, akin to how J.A.R.V.I.S. assisted him in his early days