Slave

The Slave of Ali ben Bad served his master faithfully, if sullenly. When he came across Will Robinson on their asteroid home, he was overjoyed to have a slave of his own and set Will to work stoking the furnaces that kept the asteroid habitable. He later discovered that Dr. Smith resembled his former master (killed by ben Bad) so closely that he became convinced that Smith was he and released him. At Smith's command, they sought ben Bad out and Smith commanded the slave to kill him.