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,

This article contains spoilers for “Fantastic Four: First Steps,” now playing in theaters. “Fantastic Four: First Steps” marks the official entry of Marvel’s First Family in the MCU, and there are plenty of references and Easter eggs from the comic books in the new movie.