The Doctor can never be alone. He/She is always supported by a companion. After the success of The Villains of Doctor Who, the editors of that book turn their Tardis towards the Companions of Doctor Who. Popular characters in the world of Doctor Who including Donna, Clara, Amy, Ace, and Sarah Jane are all covered by a diverse group of writers who all love and study Doctor Who. Each writer was given the choice of which character to cover and then writes an essay about what that companion brought to the series, the fandom, and the Doctor.