Dervish (The Space Pirates)

Dervish was an engineer for the Earth government before becoming Maurice Caven's second-in-command in his band of space pirates. Dervish was worried if they destroyed to many beacons, they would have the whole Space Corps chasing after them.

They returned to their base on Ta, where Caven had him install a remote control device into Milo Clancey's spaceship, LIZ 79.

When Caven's plan to blackmail the Space Corps by blowing up Ta was foiled by the Second Doctor, Caven and the rest of the pirates made a quick escape in their Beta Dart. However, General Nikolai Hermack had Major Ian Warne destroy the Beta Dart, killing Caven, Dervish and the rest of their men. (TV: The Space Pirates)