"The Claws of Axos" episode of Doctor Who marks the first and only appearance of the Axons. An approaching alien spaceship is detected on monitoring equipment at UNIT HQ, where the Brigadier is entertaining two visitors: Chinn, a civil servant making a security inspection, and Bill Filer, an American agent sent to discuss the threat of the Master. The ship lands in England and the UNIT team meets its occupants, a beautiful golden-skinned race of humanoids called Axons. The Axons claim that their ship, Axos, is damaged and that they need time in which to repair it. In return, they offer Axonite, a substance that can cause animals to grow to enormous sizes and thus end global food shortages. The Doctor is suspicious, and rightly so. Axos, Axonite, and the Axons are all part of one hideous parasitic entity brought to Earth by the Master to feed on the planet's energy and consume it. The Doctor manages to materialize his TARDIS, with the Master on board, at the center of the Axos ship. Outmaneuvering the Master, the Doctor offers to link the two ships together to make one giant time machine, on condition that Axos in return helps him to take revenge on the Time Lords for exiling him to Earth. The trick works and Axos is locked in a time loop from which it can never escape. The Doctor returns to Earth in the TARDIS, where he reluctantly admits to the Brigadier that the Master has escaped.