Drudger

The Drudgers were hovering creatures. They crash-landed on a mysterious planet with a high gravity. They used a mind scan on the Seventh Doctor and Elenya. They were massacred by the assassins who had arrived to kill Sancroff, First Knight of Velyshaa. (AUDIO: The Sirens of Time)

Alby Brook's ship was equipped with a Drudger at the time of the Dalek invasion of Mutter's Spiral in 4162. (AUDIO: Invasion of the Daleks)

Space Dock Nerva was equipped with security Drudgers when it was visited by the Fourth Doctor and Leela. (AUDIO: Destination: Nerva)