Grant ( The Return of Doctor Mysterio ) Grant was a man who gained " superpowers " and went under the alias of the Ghost . Grant gained his powers by accident as a child , due to mistaking the Hazandra for medicine . For 20 years he kept the promise to not use his powers , until the Doctor could return . Eight years after defeating Harmony Shoal , the Twelfth Doctor returned and took Grant and his family on as companion s in an adventure to find the sisters to the crystal inside Grant . Biography . Meeting the Doctor . Grant met the Twelfth Doctor as a child , when the Time Lord accidentally fell into his own trap to prevent temporal paradoxes in New York . Initially mistaking him for Santa Claus , Grant was corrected ; due to his love of comic book s , he dubbed the stranger " Doctor Mysterio " . He was given the Hazandra , a small gem , and led to the roof , where the Doctor explained he was trying to straighten out the paradox es he caused . When the Doctor asked for the gem to power his device , Grant revealed that he ate it , having mistook it for medicine for his cold ; at that moment , the Doctor revealed that it granted wishes and Grant got his superpowers . The Doctor made him promise not to use his powers until he returned . Teenage years . In his high school days , he fell in love with Lucy Fletcher , but was not able to confess his feelings for her . Puberty caused frequent instabilities , including one occasion where he was unable to turn off his X - ray vision and saw naked people everywhere . He would also levitate without meaning to do so . During this period , the Doctor kept an eye on him . Becoming " the Ghost " . Years later , Grant broke his promise by taking on the superhero identity of the Ghost , this led him into a confrontation with Harmony Shoal , which planned to takeover the world by replacing the brain s of world leaders with alien s . During this adventure , Grant reunited with the Doctor and revealed his true identity to Lucy , who had become a reporter covering his exploits as the Ghost . ( TV : " The Return of Doctor Mysterio " ) Grant and Lucy got married . Grant didn ' t stay away from being " the Ghost " for long . As his step - daughter grew up , " bank robberies and all that flying off midsentence " were " commonplace " . ( COMIC : " Ghost Stories " ) Travels with the Doctor . On the 26 December eight years after the Harmony Shoal incident , Grant re - encountered the Twelfth Doctor while stopping a robbery at the City National Bank . The Doctor wanted Grant ' s help in finding the other three crystals like the one inside Grant . Grant refused to go with the Doctor unless he could bring his family , so Lucy and Jennifer came along on the quest . ( COMIC : " Ghost Stories " ) Superpowers . Ingestion of the Hazandra , combined with his love of comic book s , gave Grant numerous superpower s . He was capable of flight and levitation , able to travel through the air at high speeds , including the vacuum of space . He also had superhuman strength , and was able to stop the Shoal spaceship from crashing into New York City with just his non - dominant right hand . Grant possessed super - hearing which the Doctor utilised to communicate to him via frequencies no other person on Earth could hear . X - ray vision allowed Grant to see through solid objects , including clothing . He was also pyrokinetic , able to light a candle with a snap of his fingers . He also snapped his fingers to break a window that , which according to Mr . Brock , " were built to withstand blasts equivalent to four nuclear explosions " , all . ( TV : " The Return of Doctor Mysterio " ) Behind the scenes . Two playable characters in the " Doctor Who : Legacy " mobile game are based on Grant : one on Grant as a young boy played by Logan Hoffman and the other on the adult Grant played by Justin Chatwin . Promotional material for " The Return of Doctor Mysterio " identified this character as “ Grant Gordon ” , but this surname has not appeared in an in - universe source as of 2018 .