User blog comment:Alanomaly/Top 10 Ben 10 Plot Holes/@comment-7503158-20160412091757/@comment-7503158-20160413040610

And how would you know it does not work like that? We never get an explanation of how it works, this is Ben 10 logic where a watch can alter your DNA. So it is possible for Vilgax to program it like that. Plus he had it for decades, during the Washington period, so he had plenty of time to hack and fiddle around with the bomb.