4. Billy Shipton
Forget Carey Mulligans Sally Sparrow, shes long gone and in Hollywood, hooking up with Jay Gatsby. What about the other fan favourite character from the amazing Blink? Despite having ten minutes of screentime on the outside, Billy Shipton, the flirty young detective who became the elderly, dying DVD salesman with a beloved wife, is remembered and adored by the fandom for his charisma and charm. He arguably had better chemistry with Sally than the forced romance between her and Lawrence Nightingale. The implications of his story are endless from a successful career in the modern day, sent back to an era where race was even more of a hurdle to moving anywhere in life, he managed to succeed and find happiness, a wife and family. The 1960s and 1970s are an era we need to see on New Who again, as the success of the 1969-set Impossible Astronaut proves. Billy would make the perfect one-shot companion to the Doctor, perhaps as he rushes around 1970s London in a story perhaps calling back to the Third Doctors era. And the choice Billy might have to make at the end return to the 2000s with the Doctor and find a different way around the loop in Blink (after all, Eleven has a lot less respect for timey-wimey paradoxes than Ten) or stick with his new girlfriend and the friends he made in the 1970s?