[Dr. Sivana]

There are parts of Logan's Run that are quite memorable...

That's the movie, NOT the TV show. The TV show actually had an upgrade in the leading lady (except she couldn't act) Heather Menzies.

[Flavious_Maximus]

Heather Menzies was definitely easy on the eyes, but I would not call her an upgrade to Jenny Agutter. Jenny is still hot.

The worst Scf-Fi TV show has to be the Planet of the Apes series. That was pure schlock.

[Tanniker Smith]

Upgrade??? Okay, no knock on Ms. Menzies but, c'mon, that was Jenny Aguther in the film!

(okay, so she was the first nekkid lady I ever saw in a movie, but still!)