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Spoiler Alert: This episode reveals key details and major plot points from Ironheart finale.
The finale of Ironheart didn’t just close the chapter on Riri Williams’ first solo story; it also cracked open a hellish door to the future of the MCU. After six episodes blending tech, trauma, and unexpected magic, the miniseries capped things off with one of the most whispered-about reveals in Marvel fan circles: the arrival of Mephisto. Yes, the devil himself is finally here, and he didn’t come quietly.
In the last episode, titled The Past is the Past, Dominique Thorne’s character, Riri Williams, had to deal with the fallout from fusing her high-tech prowess with the perilous unpredictability of magic. The Hood (Parker Robbins, played by Anthony Ramos), now fully consumed by his demonic power, became more unhinged by the minute. Riri, still reeling from the loss of her AI companion N.A.T.A.L.I.E. (modeled after her late best friend), took him down with a blend of magic-infused armor and grit.
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But the real gut punch came after the fight. In a quiet moment inside a pizza joint, Riri met a strange man. That man is Mephisto, portrayed with an eerie calm by Borat star Sacha Baron Cohen. It’s a blink-and-you’ll miss-it moment unless you’re listening closely because the name he drops is one Marvel fans have been waiting years to hear. Riri, unimpressed and emotionally drained, barely reacted. But what came next changed everything.
Arghhh, Human Mephisto in Ironheart?! And you’re telling me this show’s sh*t? Omg, this just became top 3 Marvel TV!!! #Ironheart pic.twitter.com/DjuXhs94El
— ً (@Onlykayoo) July 2, 2025
In a desperate moment, Riri made a deal with Mephisto, but not for power or glory; rather, to bring Natalie back. And Mephisto sort of delivered. He brought back the real Natalie, Riri’s long-lost flesh-and-blood friend, rather than the AI. But the emotional reunion was marred by a sinister cost, as ominous veins appeared on Riri’s arm, suggesting that the devil doesn’t give away free things.
I still can’t get over how good Mephisto was in Ironheart. I need more of him!! pic.twitter.com/wKpU1Ysgrj
— JetSetHan 🔜 Anime Expo (@JetSetHan) July 2, 2025
Fans have speculated about Mephisto since WandaVision. For years, he was the boogeyman behind every twist. But now, at long last, the demon is real and in the MCU for good. Played with quiet menace by Sacha Baron Cohen, Mephisto’s appearance in Ironheart isn’t just a fun cameo. It’s a signal. Marvel is finally ready to tap into the darker, more mystical side of its universe.
Fans are excited about the character’s arrival as speculations continue regarding the new antagonist’s future. Mephisto’s transactions have extensive ramifications. He corrupts the innocent, manipulates young heroes, and sets off apocalyptic events in the comics. His recent agreement with Riri may be the catalyst for her demise or change.
Mephisto in this scene was absolutely bone chilling. The way he changed his voice like that was so sick. Sacha Baron Cohen killed it👏🏽🔥 #Ironheart pic.twitter.com/YdHAy2JYbl
— 𝙶𝚒𝚜𝚎𝚕𝚕𝚎//💥⏳ 💍💫 (@giselleb1234) July 2, 2025
Ironheart leaves us with a lot to chew on. Riri’s journey is just beginning, but she’s already paid a steep price for trying to do the right thing. With Natalie mysteriously restored and Mephisto lurking in the shadows, the stage is set for something darker, deeper, and far more dangerous than tech battles or corporate villains.
If Marvel decides to greenlight a second season or tie this arc into bigger projects, Riri’s soul might be the next battleground. One thing’s for sure: the devil is here, and his games have only just begun. Ironheart is available to stream on Disney+.
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