Donna Noble
In the Doctor Who universe, the planet Mars is home to two known forms of sentient life: the Ice Warriors, a race of reptilian humanoids, and The Flood, a sentient, water-borne virus encountered by the first human base on Mars in the episode "The Waters of Mars" (2009). The Tenth Doctor was incorrectly identified as a Martian by Donna Noble during their meeting in, "The Runaway Bride" (2006), with the Empress of the Racnoss.