William Shatner and Star Trek fans pick best captain
For the first time in Europe, all five Star Trek captains have gathered for a convention.
William Shatner joined Sir Patrick Stewart, Avery Brooks, Kate Mulgrew and Scott Bakula at Destination Star Trek in London.
Shatner said: "Getting together is a problem because we live in divergent areas of the world."
BBC News asked Shatner and the fans about their favourite Star Trek captain.
Video journalist: Rachel Curtis