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You can watch Ben 10 (2005) for free on Tubi TV.

When 10-year-old Ben Tennyson discovers a mysterious device, he gains the power to change into ten different alien heroes, each with uniquely awesome powers. With such abilities at his disposal, Ben realizes a greater responsibility to help others and stop evildoers, but that doesn't mean he's above a little superpowered mischief now and then.

A summer road trip turns chaotic when a cosmic watch grants a preteen the ability to morph into a roster of bizarre extraterrestrial warriors. Balancing newfound heroism with typical childhood mischief, this kinetic adventure thrives on the creative chaos of its alien transformations.