When we tend to (very fondly) remember Deep Space Nine, we champion its boldness: Serialised storytelling, a darker look at a utopia in crisis, the daunting dramas of the Dominion War. But it wasn't always a bleak examination of Trek in wartime - and the latest expansion for Cryptic's free-to-play Star Trek Online, Victory is Life, remembers that well.

Star Trek gave us six TV series, spanning over 700 episodes, because it's such a rich universe. And a Federation starship is the perfect vehicle to tell unforgettable stories. But which Star Trek stories are the best? To find out, we painstakingly compiled the 100 greatest Trek episodes, from any of the series.