The Space Controller was a Time Lord associated with Gallifrey High Command. He wore a purple uniform with golden epaulettes and had light brown hair.
K9 Mark I reported to the Space Controller during his time going on missions on behalf of Gallifrey. When the Time Lords heard worrying reports that the Zeta Cancri star system might go supernova due to the fallout of the nuclear war between the Megallan Empire and the planet Telios, destroying nearby Gallifrey in the process, the Space Controller called K9 down from his test flying of the K-NEL and took him to meet the Leader of the Time Lords, along with two of his advisors.
After K9 returned from the mission much later than expected, the Space Controller berated him for his lateness. K9, who had stayed to help Dea build a hospital to heal the few survivors of the war that he had found, vaguely answered that he had been trying to "understand humanoids". (PROSE: K9 and the Zeta Rescue)