Mikhail Kerenski
From Tardis Wiki, the free Doctor Who reference
Mikhail Kerenski was the brother of Yuri Kereski. Kerenski lived in Daghistan in the early 21st Century. Due to the Doctor, and his involvement in the events on the Bowie Base One, he saved Yuri from being killed in the recorded explosion of the base. (DW: The Waters of Mars)