Didn’t Jonathan Frakes host that?
I know he hosted Beyond Belief: Fact or Fiction but I don’t think he did the Alien Autopsy one.
What’s funny is that former Governor (well YET to be governor in that case) and wrestler Jesse Ventura is one of the “Men in Black” in this episode (Alex Trebek being the other one o.O), who would go on to host his own Conspiracy Theory show in the late 2000s.