Ironheart Episode 6: [Spoiler]’s Cameo in Finale Explained

Marvel’s Ironheart has finally answered a long-standing fan theory by introducing one of the most anticipated villains in the MCU. The devilish character makes his grand debut in Episode 6, the finale, confirming rumors that have circulated since WandaVision. So who is it? Here’s a breakdown.

Who is Sacha Baron Cohen’s Mephisto in Ironheart’s finale?

Mephisto enters the story as the true puppet master behind Parker Robbins’ descent into darkness.

Ironheart’s early episodes teased a mysterious voice tempting Parker, echoing how the Green Goblin’s mask haunted Norman Osborn. The finale, titled The Past Is the Past, finally reveals the truth: Mephisto was behind the whisper all along.

For those unversed, in a scene filled with tension and dark temptation, Mephisto appears to Parker after a botched heist. He lures the desperate criminal into accepting the cloak, promising it will make all his dreams come true. The devil lies, of course. As Parker spirals, Mephisto sets his sights on Riri Williams, aka Ironheart.

His offer to Riri? A deal to create something “iconic” together—one that echoes classic Faustian bargains. In a blink-and-you’ll-miss-it moment, viewers catch a glimpse of Mephisto’s true form: red skin, yellow eyes, and a devilish grin, reflected in a teaspoon as he stirs his coffee. Later, he smugly reveals his name.

This version of Mephisto in Ironheart’s finale is slick, manipulative, and perfectly timed. Marvel fans have waited since WandaVision for the devil to show his face. Rumors swirled during that series, but it was Agatha and the Darkhold pulling strings then. Now, with Sacha Baron Cohen in the role, Marvel finally delivers on the long-held speculation.

Created in 1968 by Stan Lee and John Buscema, Mephisto has clashed with heavyweights like Spider-Man, Silver Surfer, and Ghost Rider. His appearance in Ironheart opens new doors for Phase 6, hinting at a darker and more mystical future for the MCU.