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Marvel Studios has officially revealed a major part of its Phase 6 cast for Avengers: Doomsday, and fans were quick to notice the return of some of the MCU’s most compelling villains. With 27 characters confirmed so far — and more still under wraps — this ensemble is shaping up to be one of Marvel’s most ambitious projects yet.

Whether they’re returning baddies from the Infinity Saga, multiverse threats, or conflicted antiheroes, the MCU villain lineup in Avengers: Doomsday will play a central role in shaping the multiverse’s fate.

Below is a breakdown of every confirmed villain (and possible villain) in Avengers: Doomsday so far.

Loki – God of Stories Returns
Actor: Tom Hiddleston
First Appearance: Thor (2011)

After completing his powerful arc in Loki Season 2, Tom Hiddleston returns as a redefined version of the God of Mischief. No longer the chaotic trickster from earlier Thor films, this Loki now holds the title of the God of Stories, a powerful multiversal role.

Why He Matters:
Loki’s knowledge of timelines and branches, as well as his deep connection to Kang variants, makes him essential to the multiverse storyline in Avengers: Doomsday.

Namor – The Underwater King’s Next Move
Actor: Tenoch Huerta
First Appearance: Black Panther: Wakanda Forever (2022)

As the ruler of Talokan, Namor was introduced as a major antihero, driven by his desire to protect his people from the surface world.

Status in Doomsday:
Though he ended Wakanda Forever in a temporary alliance with Shuri, Namor’s deep-rooted distrust of surface nations might push him into a morally grey role in Avengers: Doomsday.

Ghost – Quantum Chaos Returns
Actor: Hannah John-Kamen
First Appearance: Ant-Man and The Wasp (2018)

Ghost, aka Ava Starr, was last seen attempting to stabilize her quantum-phase condition. She’s set to return in Thunderbolts before her appearance in Doomsday.

What’s at Stake: Depending on her development in Thunderbolts, Ghost could either aid the Avengers or remain a volatile wildcard in the battle against multiversal threats.

Sentry – The Unstable Superpower
Actor: Lewis Pullman
Debut: Thunderbolts (2025)

Sentry will make his debut as a near-unstoppable force in Thunderbolts. Comic fans know him as one of the most powerful—and unstable—characters in Marvel history.

Powers Include Superhuman strength, flight, energy projection, Possessed by an evil entity called “The Void”

Why He’s Critical:
If Sentry’s mental state breaks, he could become the single greatest threat in Avengers: Doomsday—stronger than the entire Avengers team combined.

Magneto – Mutant Power Enters the MCU
Actor: Ian McKellen
First Appearance: X-Men (2000, Fox)

Ian McKellen’s Magneto finally makes his MCU debut, bringing decades of mutant history into the Marvel Cinematic Universe.

Multiverse Angle:
It’s unclear whether McKellen’s version is from the Days of Future Past timeline or a brand-new variant. His allegiance remains unpredictable—he’s been both friend and foe to the X-Men in the past.

Mystique – The Shapeshifter Returns
Actor: Rebecca Romijn
First Appearance: X-Men (2000, Fox)

Rebecca Romijn reprises her role as Mystique after nearly 20 years, last seen in X-Men: The Last Stand (2006).

Role in Doomsday:
Appearing alongside Nightcrawler (Alan Cumming), her inclusion could indicate a larger multiversal X-Men arc within Avengers: Doomsday.

BONUS: Doctor Doom – The New Big Bad
Actor: Robert Downey Jr.
First MCU Appearance: Avengers: Doomsday (2026)

Yes, you read that right. Robert Downey Jr. returns to the MCU not as Iron Man, but as Victor Von Doom—the genius sorcerer and ruler of Latveria.

Significance:

Central villain of Avengers: Doomsday
Key to replacing Kang as the Multiverse Saga’s new antagonist
Might connect to Fantastic Four: First Steps

Doctor Doom is expected to take the place of Kang the Conqueror as the next overarching threat. With Downey’s acting range and Marvel’s narrative pivot, this casting decision has electrified the fandom.