A lot of "Stargate SG-1" episodes would qualify too. One of the premises of the show is that the ancient "gods" were actually members of a highly advanced but cruel alien race, who posed as gods in order dominate and enslave humanity.
That's true. Stargate SG-1 is also one of my favorite programs, and coincidentally, "Lord Ares" will be introduced soon as the latest baddie.
Actually, I'd sooner believe the premise of this show than that ol' Zeus will be coming down from Mt. Olympus to greet his faithful...