Yuri Kerenski

Yuri Kerenski was a Russian nurse and part of the Bowie Base One Mars colony. He was a known joker, placing a "No Trespassers" sign outside the base. He did had a brother; Mikhail.

Yuri looked after a quarantined Maggie Cain after she was infected by Andy Stone. He was destined to die in an explosion of Bowie Base One, however he escaped along with Mia Bennett and Adelaide Brooke when the Doctor interfered with the course of events and rescued them. (DW: The Waters of Mars)