In no order at all:
Lexx: The characters are such oddballs that you can't help but wonder what will happen to them every episode, and same thing applies to the storyline. People tend to write it off as sexy fluff, but in my opinion it's one of the most creative shows that has ever been made. And won't mention my feelings towards Zev.
The Outer Limits (60's version): I've never seen an episode I didn't like, and one of them gave me a serious case of the creeps when I was a kid (A military base out in the desert was being attacked by these HUGE hairy ants with vaguely human faces, the concept was so disturbing to me that I thought they were under the couch.). Wonderful stories, the best opening sequence of all time, and the weirdest mood music ever made. I wish they showed reruns of it.
The Twilight Zone (60's version): Rod Serling is, and forever will be one of the coolest people ever to walk upon this godforsaken rock. I've walked away from viewing that show feeling liked I got hit in the head with a clawhammer, and I've stayed up at night staring at the walls pondering the lessons that were given to me. Any show that makes you truly think is a blessing, and I've learned a lot from that one.
Battlestar Galactica: Cheesy as hell, but those Cylons (sp?) rocked. So did their ships. They had two really great episodes that I remember. One was when the Cylons went on a suicide run and just crashed into the fleet, wrecking everything. The Galactica was on fire, people running around in a panic, man that was fun. The other one (A two parter I think) was when they found the other Battlestar. I forget the name of it exactly, but those guys didn't fuck around. They wanted the Cylons on a plate and they were pretty bloodthirsty compared to the Galactica. In the end the two battlestars take on one of the big Cylon bases, and the other battlestar is seemingly destroyed... or maybe not. It was all up in the air and I was praying to see that other battlestar again. But it never happened.
😡
The Night Stalker: NOBODY remembers this show. Then again I had to see it in reruns, since the whole thing started in 72 and I was around four at the time. Before there was Scully and Mulder, there was Carl Kolchak. He didn't have the federal government on his side, he was a goddamn reporter for fuck's sake. And he had to deal with monsters by himself. It ran for only a season, but it was a hell of a show.
I could mention others (Star Trek, Dark Shadows, Farscape, Space 1999)But the ones I wrote about are the top 5 I think. Oddly enough I when I think Sci-fi, I tend to go retro. LOL