Nick Fury struggles to launch The Avengers when candidates are targeted by a serial killer.

A grief-stricken Doctor Strange uses the Eye of Agamotto in a dangerous effort to change the past.

Thor, who never learned to be a good hero, throws an out-of-control intergalactic party on Earth.

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

The Watcher breaks his oath and recruits heroes from across the multiverse to battle against Ultron.