Heroes United in order

Heroes United Collection is a series of direct-to-video animated superhero films from Marvel Animation. They are the first full-length direct-to-video CG animated features created by the animation studio 2 films, 2h 22m in all, in release order.

1. 1
   

   Iron Man & Hulk: Heroes United

   2013 · 71 min

   The Invincible Iron Man and the Incredible Hulk must join forces to save the Earth from its greatest threat yet! When two Hydra scientists try to supercharge a Stark Arc Reactor with Hulk's Gamma Energy, they unleash a being of pure electricity called Zzzax - and he's hungry for destruction. Together, Iron Man and Hulk are the only force that stands in the way of the Zzzax's planetary blackout. But first, the super heroic duo will have to get through snarling Wendigos, deadly robots and the scaly powerhouse, Abomination. Can two of Marvel's mightiest heroes find a way to work together without smashing each other before time runs out?

   Snoozefest
2. 2
   

   Iron Man & Captain America: Heroes United

   2014 · 71 min

   Iron Man and Captain America battle to keep the Red Skull and his triggerman, Taskmaster, from unleashing an army of Hydra Brutes on the world! Sequel to the film "Iron Man & Hulk: Heroes United" and feature Iron Man teaming up with Captain America, it comes to accompany the live-action film "Captain America: The Winter Soldier".

   Popcorn Flick