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

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

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

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