professor travers reappears in "the web of fear". a robotic yeti he brought back from tibet is being exhibited in a museum in england. a yeti control sphere that the professor has reactivated is missing and he believes the yeti now poses a threat. he summons his daughter, anne, back from america and tries to persuade the museum owner, julius silverstein, to part with his exhibit. silverstein refuses, even turning down the professor's offer of money. however the sphere re-activates the yeti.