Two big heroes. One epic battle. In HEROES UNITED our two toughest teens come together to take on a mysterious new villain who is threatening to take them both down. In the heat of battle, Ben is sent spiraling through a dimensional rift and he winds up where? Rex's world! Will Ben's alien transformations stack up to Rex's power builds? Can the heroes unite in time to save their planets from destruction? Watch and find out what happens when Ben and Rex combine their powers for the ultimate epic showdown.