Plot summary
After Owen opened the Rift to rescue Toshiko and Jack, the Rift splinters, causing temporal cracks to widen, bringing individuals from different eras to the present day. Jack orders Torchwood to bring anyone that fell through time into Torchwood's vaults.
Toshiko and Owen investigate cases of the Black Death in a local Cardiff hospital, where Toshiko sees a glimpse of her mother, while PC Andy informs Jack and Gwen that they have a Roman soldier in police custody. In that time, Gwen sees a glimpse of Bilis Manger. Ianto sees his dead girlfriend Lisa in the vaults, who tries to convince him to open the Rift. During a heated argument, Jack fires Owen. While at a bar, Owen sees Diane, who tries to convince him to open the Rift.
Jack and Gwen go to Bilis' clock shop, where they learn that Bilis can step between eras in time. When Jack leaves, Bilis shows Gwen a vision where her boyfriend Rhys dies. Gwen rushes to Rhys and has him imprisoned in the vaults for protection. However, Bilis causes a power cut to raise a security breach in the Hub, releases Rhys, and kills him. Gwen and Jack find Rhys' body in a pool of blood. Jack tells Gwen that they cannot bring him back, but she knows the only hope of restoring him is to open the Rift.
All but Jack agree to this. Jack attempts to stop them by holding the team at gunpoint. When he insults them, Owen attacks and kills him, and scans his and the team's retinas and opens the Rift. After Jack comes back to life, they discover that Bilis has manipulated the team to open the Rift, in order to release Abaddon whose shadow kills anyone who touches it. This gives Jack an idea; he cannot die, so it can feed off his life. The shadow attacks Jack, but a blue light flows out of his chest and destroys Abaddon, killing Jack.
The Rift is now closed, but volatile. Gwen is relieved to see Rhys alive. After several days, Jack comes back to life. Jack forgives Owen and hugs him. As the rest of Torchwood go for a coffee run, Jack sees a severed hand glowing. He then hears the sound of the TARDIS materialising and departs. Gwen is perplexed at Jack's sudden departure, believing something has taken him.
Credits
Adapted from Wikipedia contributors, End of Days (Torchwood). Narrative and paragraph formatting adjusted; illustrations, reference markers and non-story material omitted.