9. Dr. Zachary Smith from “Lost in Space”: Conniving, backstabbing, self-serving, and pretty much always selling out the whole crew by siding with any old Martian, Dr. Smith was downright awful. He was always getting busted going against the others, yet the crew never took him out back and shot him with a laser gun, or had the big robot attempt choke him to death with his disproportionate tiny arms. Instead, they kept him around to nearly get them killed week-ater-week, and what’s worse, they trusted him with the little kid. Why were those two always hanging out, anyway? The answers to that are perhaps the subject of a different list all together . . . Jonathan Harris was only supposed to be on the show for a few episodes, and because he was the last one cast and not in the pilot episode, he was placed last in the credits. This upset Harris, and he insisted he be listed as the “Special Guest Star” in every episode, so even the actor was a pain in the butt!