Kiss Kiss , Bang Bang ( TV story ) Kiss Kiss , Bang Bang was the first episode in the second series of " Torchwood " . It introduced Captain John Hart and the Blowfish species . It saw the team question Jack ' s past again . Synopsis . Captain John Hart , an old friend of Jack ' s , appears through the Rift , and causes problems for the Torchwood team . Plot . It is midnight on a lonely Cardiff street . As an old woman approaches a crossing with traffic light s , a red Chrysler Crossfire sports car races through Cardiff , driven by a Blowfish . The traffic lights go red . He stops and impatiently urges the old lady to cross the street . The Torchwood SUV stops , and asks the lady if she saw the Blowfish ; she points them in the right direction . After they ' ve gone , she mutters , " Bloody Torchwood ! " The team catch up with the Blowfish after a short chase . Owen shoots the tires , forcing the Blowfish to leave the car . He flees into a house , where he shoots a resident and holds another hostage . The team hold him at gunpoint , and the Blowfish taunts them . He dares Ianto to shoot him , but Ianto hesitates . A shot is heard , killing the Blowfish . When Ianto turns around , he sees Jack , having just fired the shot . He greets the team with the words , " Hey kids , did ya miss me ? " At the Torchwood Hub , the team wants to know where Jack has gone . He tells them he ' s been with " my Doctor " . But he came back for Ianto and the rest . Tosh notices that there has been Rift activity . Captain John Hart walks through the Rift at the top floor of a multi - storey car parking structure . He sees a man held at knife - point , and intervenes , grabbing the mugger ' s neck , and dropping him over the edge to his death . John then goes to a nightclub called Bar Reunion , tells everyone whom he finds unattractive to leave , and pulls out two side - arms in front of the bouncers . Everyone panics and runs out . Meanwhile , Torchwood Three inspects the body of the dead mugger on the street . Tosh notices traces of Rift energy on his neck . Jack then gets a message on his vortex manipulator ; a hologram of John appears , telling him to come to the nightclub , alone . He does , but the others follow him in a taxi . When Jack arrives in the club , he and John approach each other and kiss , then fight . They break for a drink . John tells him that the Time Agency is gone , and he has been to several rehabs for drink , drug s , sex and murder . John sees the others , and ridicules their team name — not Excalibur ? Jack explains that John was his partner . . . in every sense of the word . John tells them that there are three deadly radiation cluster bombs scattered over Cardiff that could endanger everyone on Earth . They must be found , and neutralised . With the help of Torchwood , it ' s an easy job . They enter the Hub and John is checked for weapons . He has many , including several concealed knives and pistols . Jack takes Gwen to the side to tell her he has seen the end of the world . He shows signs of having fallen for Gwen , and jealousy when he realises Gwen is going to marry Rhys because " nobody else would have her " . Tosh , meanwhile , finds the locations of the three bombs all over the city . Gwen organises the team to go searching for the bombs in pairs : Jack and Ianto , Owen and Tosh , and Gwen and John . Jack has problems with this , and talks to Gwen alone . Gwen explains she could get to know John better , to gain his trust and learn what he is really up to . Jack relents , but gives Gwen three rules on how to handle John : keep him in front of her at all times , never trust him , and never let him kiss her . The teams split up and Gwen and John are in the container docks . After some flirting , they find a cluster bomb in a container . Once Gwen has it , John kisses her , poison ing Gwen with paralysing lip gloss . He throws away her mobile phone , and tells her that she has two hours before her major organs shut down and she dies . He shuts the doors to the container , trapping her inside , unmoving . Meanwhile , Owen and Tosh are in an abandoned building and find the bomb , but John arrives , knocks out Tosh , and shoots Owen in the hip . Jack and Ianto are in an office building searching for the other bomb . Jack asks Ianto out on a date ; Ianto accepts , but tries to change the topic . Jack explains that John Hart is a reminder of his past ; " I want him gone . " He goes to the roof , while Ianto searches downstairs . Ianto hears a noise and realises it is John , holding him at gunpoint . John tells him Owen and Gwen are in trouble . Jack finds the last cluster bomb , and is confronted by John . John wants the cluster bomb , but Jack refuses . He wants Jack to join him in travelling and conquering the stars . Jack isn ' t tempted , and throws the bomb over the edge . " " Oops ! " " John pushes Jack off the roof too . John retrieves the bomb and tells the dead Jack — splayed across the pavement — that murder rehab never worked . He returns to the Hub . Ianto goes to Owen , and helps Tosh dress his wound . They then go to the docks , and eventually find Gwen just in time to inject her with an anti - toxin . At dawn , John goes to the corpse of the Blowfish , who worked for him , and takes out a small pyramid - shaped object from his pocket . He is then surprised to find the rest of the team holding him at gunpoint , and even more surprised to see Jack , who then explains that he is immortal . John then tells the truth : there are no cluster bombs . He was looking for an Arcadian diamond that belonged to a lover of his once ; it was only a " dying woman ' s wish " in that he killed her . The " bombs " actually comprise a device that would lead him to the location of the diamond . However , once they ' ve assembled the device , the woman ' s hologram says that there is no diamond either . A device shoots into John ' s chest , and the hologram explains that the device is a bomb that locks into the DNA of whoever kill ed her ; it cannot be removed without it prematurely exploding . There are ten minutes until the bomb goes off , but John cuffs himself to Gwen . She has a plan that would kill her and John , but would save the city . Tosh says that the Rift is still open from John ' s arrival . Gwen takes John there , but Jack and Owen stay behind and quickly work on a solution . They arrive at the car park , quickly followed by Jack and Owen , who inject John Hart with the DNA of all the Torchwood members , which temporarily confuses the bomb . The bomb releases itself , and they throw it through the Rift , with just one second to spare . Just as it explodes , they are shifted back in time to the moment John first arrived . John , impressed , lets Gwen go , and reluctantly agrees to go back home . Before he disappears , though , he has one last thing to tell his old friend : " By the way , I found Gray " . Jack , shocked , is asked who or what " Gray " is . He replies " It ' s nothing , let ' s get back to work . " Story notes . Filming locations . " to be added "