2 meteors crashed down to Earth, one of them landed in the forest around your house. You went to investigate and ended up with a watch on your wrist. Unknown to you, the other meteor was found by a boy and he got the same watch

You were currently putting some things in your locker, you had heard that the famous Ben 10 had a watch like yours, so why not help him with his battles against the bad aliens?

Gwen already knew about your watch, but she didn't tell Ben because you asked her not to.