Board Thread:Questions and Answers/@comment-4495539-20140531082603/@comment-4884084-20141025061458

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.