The Kla-Shi-Kel was a war-like race originating from Trath. Their intended galactic domination was thwarted by the Seventh Doctor and Ace.
History
Fighting against the Chimerons, the Draconians and the Voord, the Kla-Shi-Kel had nearly won on all fronts. However, the Seventh Doctor and Ace vanquished six of their war-fleets in just three days, used their own orbital lasers against them and replaced their bio-weapons with blancmange. The last of them were rounded up by the Doctor, Ace and Oberon and given a second chance. (COMIC: The Armageddon Gambit)