Ironheart finally debuted one of Marvel's most exciting and powerful villains – who has many connections that could also appear in the MCU.

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

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.