Blowfish Blowfish was a name given to a race of piscine humanoid s with faces strongly resembling a blowfish . Emily Holroyd referred to them as Homoformatus piscis . Biology . The Blowfish were humanoid , but with fish - like faces . They had bright red skin , large crests on their heads and tendrils and feelers around their faces . ( TV : " Kiss Kiss , Bang Bang " , " Fragments " ) Next to the jaws were gill slits , with the sensitive gills inside . They could breathe both water and air and were revitalised with water . They had stinging , yellow sputum . Blowfish were more susceptible to electrical shocks than human s . ( PROSE : " The Undertaker ' s Gift " ) Toshiko Sato ' s scans of one Blowfish revealed high levels of algae . ( TV : " Kiss Kiss , Bang Bang " ) Culture . Blowfish seemed to have a weakness for human pleasures and on Earth they often committed a wide variety of crimes . ( TV : " Kiss Kiss , Bang Bang " , " Fragments " ) Jack Harkness considered them to be entirely self - serving . ( PROSE : " The Undertaker ' s Gift " ) History . In 102 , the Blowfish were among the races who joined the Alliance . A representative came to Stonehenge and witnessed the imprisonment of the Eleventh Doctor in the Pandorica to save the universe . ( TV : " The Pandorica Opens " ) When the plan failed , they were turned to dust and removed from the universe , along with the rest of creation beyond the Earth and its moon . They were restored when the Doctor " reset " the universe . ( TV : " The Big Bang " ) Torchwood Three frequently encountered Blowfish who had slipped through the Rift . They were one of the few aliens who could communicate with humans , though they rarely had much to say . As they were so commonly encountered , the firing range at Torchwood used pictures of Blowfish as targets . ( PROSE : " The Undertaker ' s Gift " ) In 1899 , Jack Harkness was sent by Torchwood Three to collect a young Blowfish . He was brought back to the Hub , but since there was no way to return him home , he was shot dead by Torchwood agent Alice Guppy , which Harkness objected to . ( TV : " Fragments " ) At some point after this , Tiberius Finch and Gertrude Blight , with funding from Sir Henry Montague , started breeding and experimenting on alien s , including Blowfish . When Torchwood investigated , they sent the Blowfish to attack them . Most of the remaining Blowfish were killed when Charles Gaskell blew up Finch ' s headquarters . Two unrelated Blowfish also learned of these experiments and were brought to Sir Montague by Jack Harkness , where they killed him . ( PROSE : " The Baby Farmers " ) In 2008 , another Blowfish was in league with the Time Agent Captain John Hart . He also fell victim to temptation , stealing a sports car and embarking on a drug - fuelled joyride through Cardiff . He was tracked down by Torchwood Three . He took hostages to bargain for his release , but Jack Harkness shot him in the head . Despite earlier encounters , the species were not on record at Torchwood prior to this encounter . ( TV : " Kiss Kiss , Bang Bang " ) Gwen Cooper recounted the time when she encountered a Blowfish that got its head stuck in the toilet whilst trying to rehydrate . ( AUDIO : " Department X " ) In 2009 , two Blowfish criminals , Kerko and his brother , came to Splott . Jack Harkness tried to capture them , but Kerko ' s brother was accidentally killed . This led to Kerko having a grudge against Jack Harkness and he refused to cooperate with him . When the Undertaker ' s Gift was activated and started destroying the Hub , Kerko escaped and tried to kill Jack . Kerko was eventually killed , though the repairs to time by a Vortex Dweller led to him returning to life . ( PROSE : " The Undertaker ' s Gift " ) A Blowfish observed the Doctor ' s trial at the Shadow Proclamation , possibly as a member of the jury . ( COMIC : " Fugitive " ) A Blowfish was present in the Maldovarium when Colony Sarff visited the establishment while searching for the Twelfth Doctor on behalf of Davros . ( TV : " The Magician ' s Apprentice " ) A Blowfish ' s head could be seen on display in Hedgewick ' s World of Wonders in the alien collection . ( TV : " Nightmare in Silver " ) Undated events . A Blowfish visited the Fluren Temporal Bazaar . ( COMIC : " Weapons of Past Destruction " )