Ben 10: Turn Up The Heat (Season 1 Episode 1) Continues.

Ben Tennyson is a 10-year-old boy who reluctantly goes on a summer road trip with his cousin Gwen and Grandpa Max in their RV, the Rustbucket. While camping one night, Ben sees what looks like a meteor crash in the woods. Curious, he runs to investigate and discovers that it isn't a meteor at all—it's an alien device called the Omnitrix. Before he can react, the watch-like device leaps onto his wrist and permanently attaches itself. Trying to figure out what it does, Ben activates the Omnitrix and transforms into a fiery alien called Heatblast. At first, he's excited and plays around with his new powers, but he quickly realizes he has to learn how to control them. Soon after, hostile alien robots attack nearby campers. Ben decides to use his new abilities to protect everyone, fighting the robots and saving innocent people. After a short time, the Omnitrix automatically changes him back into a human, showing that each transformation has a time limit. Although Ben still doesn't fully understand the Omnitrix, he realizes it gives him the power to help others. Grandpa Max also seems to know much more about aliens than he lets on, hinting at a mysterious past. By the end of the episode, Ben accepts the responsibility that comes with the Omnitrix, and he, Gwen, and Grandpa Max continue their summer trip, unaware that many more alien adventures and dangerous enemies lie ahead. This episode serves as the beginning of Ben's journey to becoming the hero known as Ben 10.