Sebastian

Sebastian can refer to:
 * Sebastian, a member of Torchwood 1. (DW: Army of Ghosts)
 * Sebastian Grayle, an enemy of the Eighth Doctor who made a deal with the Nimon. (BFA: Seasons of Fear)

Behind the scenes

 * Sebastian Armesto, an actor who played Broff in "Bad Wolf" and Anders in Grand Theft Cosmos.
 * Sebastian Stride, an actor who played a Crewman in Nightmare of Eden.