Gray: I never stopped believing. I always knew we'd find each other again.
Jack: I'm sorry.
Gray: Sorry's not good enough.
Gray: (to John) Get a shovel.Jack's ex-boyfriend, Captain John Hart, is back at the Hub. He kills Jack, ties him up using Time Agent handcuffs and generally acts like a jilted ex-lover.John blows up the city. Gwen, Rhys and Sergeant Andy mobilise the Welsh police force.Eventually, John takes Jack all the way back to 26 A.D., where Gray is waiting for them. It turns out that John has a bomb grafted into his skin, planted there by Gray. His over-the-top "Psycho Ex Boyfriend" act was supposed to be a hint to Jack, because Gray was listening in all along.Gray and Jack have a tearful reunion, but Gray needs closure and revenge. He starts off by killing Jack, then tells him that he's spent his whole life so far being tortured, after Jack lost track of him in that air raid. He wants Jack to be buried underneath Cardiff forever. Jack reluctantly agrees, seeing no way out, and John is forced to do the burying. However, John throws in a ring as well, claming it's a sentimental thing.John is freed of the bomb, warps to present day and immediately calls Tosh and tells her to do a scan for the ring's signal. Nothing shows up. Gray appears in the Hub and shoots Tosh. Meanwhile, Owen is trying to cool down the city's fragile nuclear power plant.There's tapping and banging from Torchwood's morgue... and it's Jack. His burial site was found by Torchwood technology in the early 20th century, and he decided to let himself be frozen and locked up in the Hub (with a timer) so he wouldn't have to spend the next few decades avoiding himself. He tearfully chloroforms his brother when Gray refuses to give him forgiveness.Tosh remotely guides Owen through the power plant system, but he's locked inside Turnmill Nuclear Station when an undetectable meltdown fail-safe kicks in, sealing the control room. Before that happens, Owen freaks out at the thought he'll die again and rages over the com-link. Tosh starts crying when she hears him screaming and tells Owen he's breaking her heart. Owen apologizes and calms down. He asks her what will happen to him, but Tosh doesn't want to say it. After pleading with her to tell him the truth, Tosh reveals the control room will vent irradiated coolant and his body will be destroyed. Owen calms down and soothingly chats with Tosh as he awaits the inevitable He and Tosh say their final goodbyes, reminiscing about that time with the space pig and that date they never really had. Tosh doesn't tell Owen that she's dying as well, thinking he'd be better off not knowing that when he's going to die, too. The venting process begins, and Owen tells Tosh he will be okay. The room starts going white, and Owen's final words are a subdued, "Oh, God..."Owen's life sign disappears from the monitor in the Hub before Tosh's eyes. Jack rushes in to find a blood trail leading to the morgue, where Toshiko is slumped over and dying. Gwen, Ianto, and John soon arrive and see her slipping away. With her last ounce of strength, Tosh tells Jack that she couldn't save Owen. Near death, Toshiko can't say anymore, but Jack tries to encourage her to stay alive. She smiles faintly at Jack before the last gasp of life leaves her body, and she goes slack in his arms. Jack and Gwen break down in tears, and Ianto struggles to hold back his own grief, leaning heavily against the medical examination table. John silently looks at their fallen teammate with regret.Jack neutralizes Gray, forgives him, and locks Gray's comatose body in the morgue. John warns Jack that Gray's not gonna simply forgive him as soon as Jack wakes him up, but Jack has seen enough deaths for one day. John kisses Jack on the cheek and steps out of his life again. He is sorry for Jack's losses. Torchwood tearfully decommissions its fallen operatives, putting away their personal belongings into storage and enacting their final logouts. But Toshiko has left a video will programmed into her records in the event she perished and got decommissioned, which she expected in her line of work. Tosh's pre-recorded "if you see this, I'm dead" message plays, and she tells the group not to mourn her, and hoped she went out doing something good. Sadly, she also posthumously confesses her love to Owen, who is also gone now, and already knew Tosh loved him. Tosh's message ends, and everybody cries. Jack braces up and says, "Now we carry on." Gwen, sobbing deeply, responds, "I don't think I can. Not after this." Jack gently tells her, "You can. We all can. The end is where we start from."From here, the story segues into "The Stolen Earth".
— Gray carrying out a Roaring Rampage of Revenge on Jack and everyone he holds dear
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