Stoyn Quadrigger Stoyn was a Time Lord engineer who was decommissioning the Doctor ' s TARDIS when the First Doctor and Susan Foreman first stole the machine . Stoyn travelled with them to Earth ' s moon . He was angry as he was in the engine room when the Doctor made his first journey . He was scared at being on a different planet . When a stasis field was released by the TARDIS , he told the Doctor that he had ruined the Archaeon s ' experiment . He wanted to leave the Doctor on the Moon and take Susan travelling with him . ( AUDIO : " The Beginning " ) Stoyn stayed on the Moon for some time , but found that the noise of too many people disrupted his focus . Stoyn left the Moon and found a sentient planet far away from civilisation . The planet created the circumstances from which Stoyn could track the Doctor ' s travels through space , and he created a wormhole drawing the TARDIS to him . When the TARDIS arrived , Stoyn encountered the Second Doctor , Jamie McCrimmon and Zoe Heriot . He wanted to drain the TARDIS of its energy . He later asked Zoe to help him build a machine . He was trying to make a hypercube . ( AUDIO : " The Dying Light " ) Romana and the Fourth Doctor visited Rome during their search for the Key to Time and tracked the sixth segment there . Stoyn presented a play in the streets of Rome called " Luna Romana " . He found the TARDIS in the temple of Luna and told Romana that he had been to the moon once . He thought that Romana was his only hope . The Randomiser later took Romana ' s second incarnation to a recreation of ancient Rome on Earth ' s moon , where she was captured by Stoyn , who had been trapped there for 2000 years . Stoyn captured the Fourth Doctor as well , and showed his prisoners pictures of their travels which he ' d gathered via components stolen from the Doctor ' s TARDIS ; during his exile on the Moon he ' d only been able to watch the Doctor ' s travels . After Romana stabilised a time field , Stoyn accidentally used it to travel back to ancient Rome where he met the first Romana , experiencing her earlier adventure from his perspective . Stoyn was furious upon learning from Romana that his job had since been replaced by a single button in TARDISes post type - 54 , and there were only a few temporal mechanics left . He tricked Romana into allowing him into the TARDIS , using the fifth segment of the Key to Time as bait . Stoyn dismantled K9 Mark II , having found the robot annoying . He declared the TARDIS property of the capitol and intended to take it back to Gallifrey and ensure his legacy . Romana said that Stoyn was remembered in the Academy , albeit as an expression for a mistake in engine repair . Stoyn , believing that the Doctor and Romana were betraying the legacy of Gallifrey itself , wanted to rewrite time so that the Doctor wouldn ' t steal the TARDIS in the first place . Stoyn was killed when an accident caused an explosion in the controls at his laboratory on the Moon , dispersing him as the temporal energy he would have used to erase the Doctor ' s travels was instead converted into solar energy that disintegrated him . During her Presidency of Gallifrey , another incarnation of Romana decommissioned Stoyn ' s Quadrigger station on Gallifrey so that the land could be used to build Battle TARDIS es . She visited Stoyn ' s abandoned station just before it was destroyed , remembering her past encounters with him . ( AUDIO : " Luna Romana " )