Place of Origin:
Death to the Daleks
Captain Richard Railton was second-in-command of the Marine Space Corps expedition to Exxilon. When he met the Third Doctor, Railton like the others were surprised by his ignorance of the plague that was ravaging various human colonies.
When the Daleks arrived, he was visibly frightened by them, as noted by Dan Galloway, and yet he proposed an alliance since the humans and the Daleks were just as powerless.
He was killed by an Exxilon. (Death to the Daleks)