In the Episode 5 "What If… Zombies?", the nexus-turning event is Janet Van Dyne has contracted a zombie virus in the Quantum Realm, and upon returning to Earth, turns almost all humans into zombies, including many of the strongest Avengers. The episode is closely based on the Marvel Zombies comic book series.

@What If...? | The movie is shown on Disney+.

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While the setting is really dark, this episode is packed with laughter, funny situations and shocking moments, and follows a plot that goes from wild to wild.

The episode's timing is probably at the beginning of the events of The Avengers: Infinity War when Bruce Banner in Hulk form returns to Earth via Bifröst, but this time it's desolate and full of the undead.

Train to Lehight Camp

Endangered by the attack of the Avengers and Thanos zombie army, Bruce is fortunate enough to be saved by Hope Van Dyne and her ants, and then they gather the surviving heroes including: Spiderman Peter Parker, Bucky Barnes, Okoye , Sharon Carter, Happy Hogan and Kurt. They detect a signal from Camp Lehigh, a SHIELD base of operations, that the survivors there has been successfully developing a method to eliminate the pandemic.

The surviving Avengers make an adventurous journey on a "Train to Busan" style speedboat to Camp Lehigh. But unfortunately, they are attacked by many familiar faces before setting off, and we see a repeat of "Civil War" as the Avengers fight each other, but this time it's different - between the living and the dead.

Wandavision love story of horror at Lehigh Camp

At Camp Lehigh, where they find Vision testing the Mind Stone - supposedly able to cure the zombie virus, and in order to be able to broadcast the frequency of the stone that covers the globe, they must go to Wakanda to obtain the technology needed.

However, it is a horror to discover that at the hands of Vision, Scott and T'Challa are still alive, but to varying degrees: Scott is missing his entire body, and T'Challa is missing a leg. Vision's facility turns out to be a little trap: he's luring people there to turn them into food for his mistress, Zombie Wanda, because Vision can't bear to lose her.

Guilt finally rises in Robot Vision: he peels the Stone from his forehead and gives it to the Avengers, which means it's his death sentence; while Zombie Wanda touchs Vision's lifeless (or offline, more exactly) robot body in pain.

The zombies of this episode are great: they maintain their superpowers, know how to use sophisticated weapons and technology as proficiently as when they were alive. Zombie Wanda even has feelings – perhaps because Vision only partially cured her. This story reminds us of Zombie Queen and King in "Army of the Dead" by Zack Snyder.

What If's Lehigh Camp is actually Wandavision's Westview Town. The difference is that Wanda created Westview to revive Vision, and Vision maintained Lehigh Camp to keep Wanda.

Zombie Thanos is waiting in Wakanda

On their flight to Wakanda, the Avengers raise hopes to save the planet. But as The Watcher puts it, "this could bring about the end of the universe", because in Wakanda, the zombie Thanos with the infinity gauntlet waiting for the Mind Stone to make full set for the blip.