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.

When Avengers Tower is attacked during the holiday party, Happy Hogan must prove his hero chops.