Cyberwoman ( TV story ) Cyberwoman was the fourth episode in the first series of " Torchwood " . This episode marked the first time that Ianto Jones played a major part in the series . It also marked the first appearance of a villain from " Doctor Who " . Additionally , Gwen Cooper discovered that Owen Harper had developed a sexual attraction to her in a not - so - subtle way , and this powerful lust for her would soon become a temptation that put a wedge in her relationship with Rhys Williams . Synopsis . Ianto has a dark secret , tied to the basement of the Hub — a secret he will protect at any cost : a semi - converted Cyberwoman ! Will Torchwood Three fix things in time before the Cybermen , ripe from battle with their greatest enemy , the Doctor , convert the world ? Plot . During a mundane day at Torchwood Three , the team decide to go get a drink , but Ianto politely stays behind . Once alone , he brings a Japanese doctor named Tanizaki into the Torchwood Hub , and takes him to a holding cell deep below the surface . There , a partially Cyber - converted woman is strapped to a conversion unit surrounded by instruments keeping her alive . Ianto introduces her to Tanizaki as Lisa Hallett , his lover . They both worked at Torchwood One in London before its fall in the Battle of Canary Wharf . Lisa was only partially converted during the battle , and Ianto managed to get his half - Cybernetic girlfriend to safety afterwards . He rigged the equipment in secret to keep her alive , hiding her in the Hub ' s basement in hopes of curing her . He hopes Dr Tanizaki , a cybernetic s expert , can undo the conversion and make her human again . They take her to the autopsy lab and let her breathe on her own , but soon the rest of the team return to deal with a rogue UFO . Ianto leaves Dr Tanizaki to take Lisa back to the cell while he prepares for the team ' s arrival . After he leaves , Lisa ' s Cyberman influence takes over . She attempts to " upgrade " Dr Tanizaki to repay him for his favour , kill ing him . As the rest of Torchwood deal with the Arcan leisure crawler that ' s entered their atmosphere , there is a brief power flicker ; Ianto covers up by claiming that the generators have been acting up all day and offers to look into it . Returning to Lisa ' s cell , he finds Dr Tanizaki ' s body blood ied and mutilated after a failed cyber - conversion , with Lisa standing over him . Ianto tells Lisa to stay in the cell as he drags off the corpse to hide it from the team . Lisa re - enters the cybernetic unit and begins to drain more power from Torchwood , soon noticed by the others . Arming themselves , Gwen and Owen head for the holding cell where the power drain is occurring , believing themselves under attack . Once there , they find and Owen recognises the cyber - conversion unit , but are attacked by Lisa . Owen is knocked out . Gwen points her gun , and tries to reason with Lisa , who knocks the gun out of her hand and pushes her over . Gwen lands on her back on the conversion unit . Before she can sit up , Lisa straps her down . Jack tries to shoot Lisa before she can start the unit up , but Ianto tackles him , allowing Lisa to escape after starting up the machine , leaving Gwen powerless as the machine ' s saws and knives get closer to her head . Gwen is terrified and yells for help . Jack tries to shut off the conversion unit but Lisa had altered the machine . He calls Tosh and tells her to shut power off to the base . Tosh does this , which unfortunately also means entering total lock - down . The team regroup in the Hub as the power is drained further by Lisa to recreate a new army of Cybermen . Jack demands that Ianto tell them everything . Ianto pleads that since he cleans up after Torchwood but is never asked about his life , they should help him restore Lisa , but Jack maintains that there is no cure . Ianto asks that he be permitted to reason with Lisa before the team attempts to attack her again . Lisa appears in the Hub and Ianto tries to remind Lisa she is still human , but she is disgusted by her partially - human appearance . She offers to implant her brain into Ianto , believing that sharing the same life is true love , but Ianto refuses . Lisa therefore declares the two incompatible and throws him aside , knocking him unconscious and sending the rest of the team into action . Jack orders Toshiko to go to the surface with emergency power cells so they can open the weapons lockers while Gwen and Owen are to search for any weapons . He will try to delay Lisa ' s advance . Lisa electrocutes Jack twice , to Gwen ' s and Owen ' s shock . Gwen and Owen are momentarily trapped by Lisa in the autopsy lab , and hide in a locker . As Lisa searches for them , Gwen and Owen kiss . Gwen ' s phone rings , alerting Lisa to their hiding place and Gwen and Owen to try to escape . As Lisa corners Gwen , Owen grabs a scalpel and stabs Lisa in the chest seemingly killing her . When Lisa starts to revive , they escape to the main Hub where they find Jack , very much alive . Jack sprays Lisa with a special " barbecue sauce " that helps their pet pterodactyl identify its prey . As it attacks Lisa , the rest of the team , along with the recovered and protesting Ianto , escape through the invisible lift . Upon exiting the lift , Ianto punches Jack . Tosh runs up to them and tells Jack that she rigged the doors to open after a few minutes and Ianto runs to go back inside . At the entrance to Torchwood , Jack and the rest of the Torchwood group catch up to Ianto who pulls a gun on them and threatens to shoot them if they try to stop him . Jack knocks the gun away , pulling his own and threatens to shoot Ianto , warning that if he fails to kill Lisa within ten minutes , he will come down and kill them both . Ianto returns to Torchwood by himself . Unbeknownst to the team , a pizza delivery girl , using Torchwood ' s other entrance to bring some pizza s ordered earlier by Ianto , finds the pterodactyl on the floor . Then Lisa is suddenly behind her . As Ianto makes his way to the holding cell , he finds Lisa ' s body has died . The delivery girl , appears calling Ianto . She has a large cut across her forehead , claims she is Lisa and she took the girl ' s body so they could be together . She begs Ianto to hold her . Crying , Ianto hugs her , then pushes her away and holds her at gunpoint . Lisa tries to explain she did this for Ianto . He cries and fails to shoot . She promises they can be upgraded together . The rest of the Torchwood team arrive just in time to hear that , and open fire on the girl , killing her and leaving Ianto to mourn over Lisa ' s body . The next day , Ianto enters the Hub . Jack and Gwen watch him cleaning up and they discuss how Ianto couldn ' t bear to live without Lisa . Gwen asks Jack if he would have shot her if she had stood by Ianto . Jack simply states that she didn ' t . When she asks , he refuses to tell Gwen that he ' d ever loved anyone to the extent that Ianto loved Lisa . They continue to watch in silence . Story notes . Filming locations . " to be added " Production errors . " to be added "