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?

At its core, Ironheart explores how far people will go to make up for their past failings — and how those efforts can go wrong. Even a noble goal can lead someone down a dark path, the show suggests,