Doctor Who Actress: 'I Prefer Star Trek'.... Doctor Who star Freema Agyeman has shocked fans of the legendary sci-fi show - by admitting she prefers rival programme Star Trek.Agyeman, who plays the Time Lord's new assistant Martha Jones on the Bbc show, has even been to Star Trek fan conventions.She says, "I grew up with Doctor Who but was more interested in Star Trek. I even went to a couple of fan conventions."