Board Thread:Questions and Answers/@comment-4495539-20140531082603/@comment-1413089-20141025074812

Torresp wrote: Lord of fish wrote: I think it's Kenny. He was so intent on getting Ben and Kai together (to protect his own existance, of course). And he almost called Ben "dad". And he was in Ben's house in the end of the episode, and it can't be easy to get into Ben 10,000's house unless you live there or something. And him being Ben's son would also explain where he got the technology to time travel. I'm not sure Spanner lives with Ben in the future, because it looked like he was sneaking around. First of all, Kenny uses an Omnitrix to fight, not lasers. Second, Spanner is the kind of slippery being who just comes and then vanishes. Like I said, he was "just passing by".

If he said Ben was his father, but didn't mention Kai, Ben would probably scream. 1: Ken wouldn't want his dad to know he was Spanner in any era

2: The events of Ken 10 occured in an alternate continuality from the main series. (it even says so on the episodes wiki page). In Ken 10, Kevin never became good instead spending thirty years in the null void.