13. Star Trek: The Animated Series (1973-1974, NBC)
What's unique about Star Trek: The Animated Series is that it basically acts as the fourth season of the live-action series after the latter went off the air prematurely. Not only did it follow the same characters and storylines of the original show, but it also starred the same actors, as well.
Debuting between the Original Series and the first Star Trek movie, The Animated Series was the last salvation for Trekkies during a time when the franchise's future was unsure. Even though the show has none of the ultra-cool sex appeal of the recent film revival, or the intelligent plots of the live-action shows, Star Trek: The Animated Series is a must-see for longtime Trekkies, or for people that simply love hearing William Shatner's voice.