1. Star Trek II: the Wrath of Khan - “The needs of the many outweigh the needs of the few” – Spock makes the ultimate sacrifice for his crewmates. Don’t worry, they get him back in the next movie.
2. The Best of Both Worlds: Part 1 (Next Generation) - Picard gets Borgified and Riker must open fire on his captain. And they make us wait until the next season to find out how it ends. Gah!
3. Amok Time (original series) - It’s pon farr time for Spock, which necessitates a trip to Vulcan – and a fight to the death with Kirk. Great bit of uniform tearing from Jim.
4. The Trouble with Tribbles (original series) - The comedy classic in which balls of fur multiply all over the ship. Doesn’t sound like fun, but it is. The Shat milks his moment for all it's worth.
5. Star Trek: First Contact – Zefram Cochrane’s first warp flight attracts the attention of some passing Vulcans thanks to the hard work of a time-travelling Picard. Just listen to that music swell.
6. Tinker, Tenor, Doctor, Spy (Voyager) – The holographic Doctor’s performance of La Donna e Mobile goes horribly awry when Tuvok starts acting all odd. Some quick lyrical changes ensure a standing ovation.
7. The Way of the Warrior (Deep Space Nine) – DS9 proved it meant business with this fourth-season opener. Worf joined the station and the Klingons showed that the peace between their race and the Federation had been well and truly shattered.
8. Star Trek III: the Search for Spock – McCoy requires a trip to the Genesis Planet but Kirk isn’t allowed to take him. Solution: the crew nicks the Enterprise and goes it alone. Take that, Excelsior!
9. The City on the Edge of Forever (original series) – McCoy alters history after falling through a portal in space and time. The only way to put things right is to let Joan Collins die.
10. The Measure of a Man (Next Generation) – Ah, the perennial Trek moral question: what it takes to be human. Picard argues Data’s right to self-determination.