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.

Mephisto has officially made his MCU debut in the final episode of Ironheart. The long-speculated demonic villain is finally here, and he’s brought with him a chilling blend of charisma, chaos, and godlike power.

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