Margaret Cain

Maggie Cain was a member of the Bowie Base One crew.

Born in Sheffield in 2028, she gained a first honours chemistry degree and went in to engineering. She would later become a British cosmonaut on the Russian Federal Space Agency mission Project Midas, beating over 25,000 other candidates, and in 2051 became the second British woman to have landed on the moon. She met the first woman, Adelaide Brooke, and the two developed mutual respect, with Brooke requesting Cain joined the Bowie Base One mission.

She flew up to the base in 2058 and worked there studying the planet Mars with a team of humans. She was infected with a virus that changed her body form. This virus was known as The Flood. She along with all the other infected members tried to infect the remaining crew and escape to Earth but failed due to the actions of The Doctor. While infected, she is shown to have a voice powerful enough to crack the ice holding The Flood.She was blown up when Adelaide her captain took "Action 5" and destroyed the Base. (DW: The Waters of Mars)

Story Notes
The Doctor's flashback to Maggie's obituary notes that she is from Grenoside, Sheffield, and is a Chemistry graduate from the University of Sheffield; two things she shares with Helen Sharman, the first Briton in space.