Craig Phillips was 21st century human.

A virtual reality game was accidentally delivered to him in 2006. Recovering from his sister's death, he used it to create a fantasy world populated by imaginary people and creatures. Craig expelled Rose Tyler into the real world, whilst the Tenth Doctor took control of the game. He rebooted the virtual world with the assistance of Cath Lloyd, who was actually a Cyrelleod from Happytimz Universal who had been trying to recover the game. With Craig's imaginary world gone, the Doctor forced him to confront his grief. (COMIC: F.A.Q.)