Check out the Lost Media Wiki’s article on the unaired Ben 10 pilot!!!
In 2003, Man of Action was working something named "Ben 10".
Steven E. Gordon created an Early version with Ben into Heroes like Dial H for Hero, but eventually turned into Aliens instead.
In 2018, An Anonymous reddit user posted something about a Lost Ben 10 Pilot, he also said that Gwen was supposed to be his classmate, but turned into his cousin.
In November 2021, A Youtube user named The Ink Tank actually found the footage of the Pilot and saw that It was real said to the creator on Twitter.
Clips of the Pilot were found.