Telos The planet Telos was homeworld of the Cryon s . It was also inhabited by the Cybermen , who used the technology of the Cryons to entomb themselves in suspended animation inside the Cyber - tomb s for centuries . Telos was in the neighbouring star system to Krelos . ( AUDIO : " Return to Telos " ) Characteristics . A world that began with " Tel " , before Red Rocket Rising ' s Acting President Eileen Klint ' s message was cut off , existed on the edge of Red Rocket Rising ' s solar system . ( AUDIO : " Blood of the Daleks " ) Following Cybermen occupation , Telos was a grey , barren , rocky world . Diamond s , vastial and other minerals could be found on the planet . ( TV : " Attack of the Cybermen " ) History . At one time Cryons , who died instantly when exposed to temperatures above zero degrees , lived on Telos . The Cryons moved under the surface when it became too warm , constructing underground cities refrigerated to the sub - zero temperatures the Cryons needed to survive . After the destruction of Mondas in 1986 , ( PROSE : " Attack of the Cybermen " ) the Cybermen later came to steal the refrigerated cities to use as repositories of Cybermen cryonically frozen in suspended animation . The Cybermen killed most of the Cryons . ( TV : " Attack of the Cybermen " ) The Cybermen from Lonsis were twice destroyed by the Eighth Doctor . It seems after Mondas was destroyed , the Cybermen moved to Lonsis , planning to invade Earth . They were foiled by Charley Pollard , who infected their ship with temporal corrosion , and later the Doctor , who increased the range of a Quantum Crystalliser programmed to destroy them . The few survivors of these attacks colonised Telos , while Cybermen from other parts of the universe colonised other planets . ( AUDIO : " Human Resources " ) Earth forces launched a final assault on Telos at the end of the Cyber - Wars and the planet ' s surface was bombarded . ( AUDIO : " Last of the Cybermen " ) Five hundred years after the last known encounter between human ity and the Cybermen , an archaeological expedition from Earth , led by archaeologist Parry ( but financed and masterminded by Kaftan and Eric Klieg of the Brotherhood of Logicians ) , landed on the planet to find the Cybermen and to revive them . With the Cybermen as their army , the Brotherhood planned to impose a regime of pure logic on human society . The Cybermen and their leader , the Cyber - Controller , were resurrected . The Second Doctor was able to seal them back inside their " tombs " and to electrify the outside gates . ( TV : " The Tomb of the Cybermen " ) The Cyber - Controller was not killed , as the Doctor had believed , but survived , and had installed a base , known as Cyber - Control underground , supervising operations in 1985 London , with which they had a communications link , and fighting the Cryon rebels who remained . The Cybermen at this time employed work parties of humans whose conversions were unsuccessful as slaves to mine the surface of the planet . The Cybermen intended to destroy Telos and to observe its blast pattern for future research . The base was , however , invaded and destroyed by the Doctor ( now in his sixth incarnation ) with the assistance of the captured Cryon leader Flast . ( TV : " Attack of the Cybermen " ) After the Hotel Historia on Earth was invaded by Graxnix , manager Majenta Pryce decided to flee and relocate to somewhere like Telos , claiming that it could use a little remodelling . ( COMIC : " Hotel Historia " ) The Eleventh Doctor later revisited Telos while trying to save Billy Jones , who had been scattered through time . At this point in time , the Cyber - tombs had returned to their multi - tiered appearance , and had become occupied by Cybus Cybermen , who began to wake from the tombs . ( GAME : " The Mazes of Time " ) The Twelfth Doctor sent " Lumpy " there to retrieve one of the pieces of the Orb of Fates , which was hidden in some ice . Once the piece was taken , the Cybermen attacked Lumpy . ( GAME : " The Doctor and the Dalek " ) Eventual Fate . At some point during the early 26th century , Telos was destroyed by an asteroid impact . ( AUDIO : " Telos " ) Other references . The Second Doctor offered to show River Song " this cool place on Telos . " ( GAME : " The Eternity Clock " ) The renegade Time Lady Iris Wildthyme once claimed to have visited the Cyber - tombs on Telos . ( PROSE : " The Scarlet Empress " ) Facing the Cybermen on a Mondasian colony ship , the Twelfth Doctor recalled Telos as one of the worlds where they rose , and that he had defeated them there by sealing them into their ice tomb s . ( TV : " The Doctor Falls " )