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

Warning! This post contains SPOILERS for IronheartMarvel's Mephisto has finally made his MCU debut, though the timing admittedly feels a little weird. A major supernatural big bad in the original comics,

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.