 Freema Agyeman's first appearance in "Doctor Who" was in the second series (2006) episode, "Army of Ghosts", where she played Adeola Oshodi, Martha's cousin.Martha Jones is introduced in the third series (2007) of "Doctor Who", first appearing in the episode "Smith and Jones".When the hospital she works at is teleported to the Moon, medical student Martha helps save the day alongside an alien time traveller known only as The Doctor (David Tennant).