Tasker

Tasker was the drill chief aboard Chasm Forge. His smartsuit was off network when the remaining suits received a command to deactivate their living components. He was therefore one of the four survivors present when the Twelfth Doctor arrived aboard the station.

Tasker was first to make contact with the Doctor, Bill Potts and Nardole as they explored Chasm Forge's repair bay. As drill chief, he took a commanding role over the other survivors and was quick to question the Doctor's authority.

Tasker was killed by the smartsuits when they broke through into station's west corridor. (TV: Oxygen)