Los Angeles, July 26 -- Robert Downey Jr's Doctor Doom has finally stepped into the Marvel Cinematic Universe. In one of the most crucial credit scenes for 'The Fantastic Four: First Steps,' viewers were introduced to the masked metal villain, who appeared before Reed and Sue's child, Franklin Richards.

Coming off as a beginning for Doctor Doom's entry in 'Avengers: Doomsday,' the scene has opened several windows for the upcoming Marvel film, considering the Russo brothers' contribution.

According to Entertainment Weekly, the Russos have directed the particular credits that featured Doctor Doom, suggesting that the sequence will be a part of 'Avengers: Doomsday.'

Speaking to the outlet, 'Fantastic Four' director Matt Shakman said, "The...