What If...? - Season 1

After an ambush in the lab, Peggy Carter steps in and takes the Super Soldier serum and uses her newfound power and strength to charge right into battle. 

What would have happened if T'Challa and not Peter Quill were picked up by Yondu as a child and became Star-Lord?

Nick Fury struggles to launch The Avengers when candidates are targeted by a serial killer. Meanwhile, Loki presented himself to the Earth governments as king of Asgard using all his diplomacy.

After losing the love of his life in a car crash, Doctor Strange becomes consumed with finding a spell that can bring Christine back to life.

When The Avengers are infected by a zombie plague, surviving heroes search for a cure.

An American soldier called Killmonger rescues Tony Stark when his Humvee is attacked in Afghanistan.
 

Thor, who never learned to be a good hero, throws an out-of-control intergalactic party on Earth. He learns a neat trick the Skrulls can do, then meets Jane Foster for the first time.

Natasha Romanoff and Clint Barton seek to destroy killer-robot Ultron following a cataclysmic event.

In order to defeat Ultron, The Watcher breaks his oath and assembles a team of heroes from across the timelines.