Mephisto debuts in Ironheart, sparking fan theories. His powers include reality bending and control over life. He grants Hood abilities and demonstrates immense strength. Some speculate he is stronger than Thanos.

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?