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Probationer Toba was a Dominator who was second-in-command of an expedition to Dulkis looking for fuel. He tended to favour violence and murder as a way of containing security threats. On this point and others, he frequently clashed with his superior, Navigator Rago, who saw killing largely as a waste of energy. He encountered the Second Doctor, Jamie and Zoe after the TARDIS materialised on an atomic test island on Dulkis. He was killed when a primed Dominator bomb was sneaked back onto his ship by the Doctor. (TV: The Dominators)