Iron Man 4

Iron Man 4 was a planned sequel to 2013's Iron Man 3 and would have been an instalment in the Marvel Cinematic Universe.

Plot

Unknown

Why it was cancelled Results
 * 1) Robert Downey Jr expressed interest in making a forth film but the project never prevailed
 * 2) A War Machine spin off was also in the works but it too was cancelled.
 * 3) Tony Stark would be killed off in Avengers: Endgame.

Robert Downey Jr will reprise his role in the currently delayed Black Widow film