Marvel's What If...? has teased an undead Captain America and some unexpected team-ups. The forthcoming series is set in corners of the Marvel Multiverse where alternate versions of familiar MCU heroes exist with very different backstories. "You know the stories, but what if one thing changes everything?" the latest teaser asks. The trailer offers a glimpse of several of the one-off episodes, including a disturbing look at Captain America falling prey to a flesh-eating virus in an instalment based on the Marvel Zombies comics. Disney This virus turns heroes and villains alike into depraved undead hordes, craving flesh and willing to kill anyone or anything in the way of their hunger.