Rago

Navigator Rago was a Dominator who led an expedition to the planet Dulkis to look for fuel.

He was so conscious of the need to conserve energy that he often resisted killing undesirables because it was a waste of energy. On this point and others, he was frequently challenged by his subordinate, Probationer Toba. He encountered the Second Doctor, Jamie and Zoe after the TARDIS materialised on an atomic test island on Dulkis. Rago briefly considered using Jamie and the Doctor for slave labor, but determined them too stupid and frail to be of much use.

He, Toba and the remaining Quarks were killed when his own bomb was sneaked back onto his ship by the Doctor. (TV: The Dominators)