SPOILER ALERT: This article contains spoilers for “ Marvel Zombies,” now streaming on Disney+.

The MCU is embracing blood and gore once again — this time in the animated universe.

“ Marvel Zombies ,” an undead spinoff from “What If…?,” is Marvel’s first M-rated animated series, following live-action, R-rated hits like “Deadpool & Wolverine” (in theaters) and “Daredevil: Born Again” (on Disney+). Bryan Andrews directed the Season 1 episode of “What If…?” that introduced a horrifying Quantum Realm virus that turns nearly everyone in the world into shambling zombies, including many beloved superheroes. With “Marvel Zombies,” which continues the story, Andrews ratchets up the viscera and dismemberment as the rating goes from TV-14 to TV-MA.

Several heroes and villains return from the

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