Marvel's "Ironheart" finally introduces Mephisto (Sacha Baron Cohen) to the MCU. But after years of delays, does it work?

After fans were fooled one too many times before, Ironheart has finally brought a major addition to the world’s highest-grossing franchise via another Hollywood megastar. While Dominique Thorne’s Riri Williams led Ironheart as something of a throwback to the Iron Man movies,

WARNING: There are major spoilers ahead for Ironheart! The Marvel Cinematic Universe has finally introduced a villain fans have been expecting for a long time, and it still managed to surprise viewers with how and when he came onto the scene.