Mephisto has finally made his MCU debut, though the timing does feel a little odd now that Phase 5 has come to a close after Ironheart.

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

A fter years of speculation, teases, and countless fan theories, the MCU has finally pulled the trigger on one of its most elusive and long-awaited characters: Mephisto. The demonic villain made his official debut in ‘ Ironheart ’ Episode 6.