Monday to Friday, 6.30pm, SF Those enjoying Star Trek: Voyager, which has bolted through the complete 172 episodes in about 35 weeks by showing an episode in sequence every weekday, will have noticed how neatly things wound up last week. The final episodes, Endgame Part 1 and Endgame Part 2, were shown on Thursday and Friday respectively. And that was that. Tonight it’s back to the future with the original series, starring William Shatner as Kirk and Leonard Nimoy as Spock. There are those who say the original has never been surpassed. Here’s a chance to find out how the whole thing began and see any classic episodes you’ve missed.