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.

For the past four ears, we've had many wild theories as to when and where we'd see the demon lord Mephisto in the MCU.

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