An old hand-animated movie has some nostalgia. A six year old computer animated one is just old. And The Hulk talks way too much.

Two of Marvel’s biggest superheroes team-up for a super-charged adventure in _Iron Man/Hulk: Heroes United_. When a Hydra experiment to use the Hulk to power a new reactor goes awry and creates a being of pure energy called Zzzax, who then attacks the power-grid, the Hulk and Iron Man team-up to stop him. The plot is a little thin and is patted out with superfluous fights that go nowhere. Still, the fights are pretty entertaining and allow each character to show off their powers. And the voice actors do a good job, and the score brings a lot of energy to the film. The animation, however, is a little rough; particularly in the texturing and fluidity of movement. Yet despite its problems, _Iron Man/Hulk: Heroes United_ is a fun animated feature that Marvel fans will enjoy.

Amazing animation, and wonderful action sequences...but rather intense for a "PG" film: http://rwlreviews.blogspot.com/2015/05/movie-review-iron-man-and-hulk-heroes.html