He captured Medok, who had escaped his medical treatment. He encountered the Second Doctor and his companions when they arrived at the colony. When Medok escaped with the Doctor's help, Ola recaptured Medok. He arrested the Doctor and Jamie after the Doctor sabotaged the colony's mind control devices. He brought them and Polly to the mines to work.
When the Doctor convinced the Pilot of the colony that the Macra were dangerous, the Macra gave Ola the office of Pilot. He put the Doctor and his companions into the pipe room so they could be suffocated by the deadly gas. (TV: The Macra Terror)