"End of Days" is the thirteenth episode and the first series finale of the British science fiction television series Torchwood. It originally aired on BBC Three on 1 January, 2007, along side the previous episode, "Captain Jack Harkness". The episode was written by Chris Chibnall and directed by Ashley Way.

The episode follows "Captain Jack Harkness", where the team open the rift to rescue Jack (John Barrowman) and Tosh (Naoko Mori) from 1941, only to find the rift has opened, causing the past and future to time to bleed through. The episode received three 2008 BAFTA Cymru award nominations, though none of them were won. The first series finale received generally mixed reviews.

During Gwen's (Eve Myles) morning off with her boyfriend Rhys (Kai Owen), they both see news reports of UFO sightings over the Taj Mahal, and an armed clash between CO19 officers and English civil war era soldiers. When she returns to the Hub, the team learns that they are caused by unstable rift activity after it was opened to rescue Tosh and Jack. Torchwood has its hands full; Tosh and Owen (Burn Gorman) investigate cases of the Black Death in a local hospital, where Tosh sees a glimpse of her mother, while Jack and Gwen find a Roman soldier in a cell.

In that time, Gwen sees a glimpse of Bilis Manger (Murray Melvin). Ianto (Gareth David-Lloyd) sees Lisa (Caroline Chikezie), who tries to convince him to open the rift. During a heated argument, Jack fires Owen.

While at a bar, Owen sees Diane (Louise Delamere), who tries to convince him to open the rift. Jack and Gwen go to Bilis' clock shop, "A Stitch In Time", where they learn that Bilis can step between eras in time. When Jack leaves, he shows Gwen a vision where Rhys dies.

Gwen rushes to Rhys and has him imprisoned in Torchwood for protection. However, Bilis causes a power cut in the Hub, releases Rhys, and kills him. Jack tells her 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, and attempts to stop them by holding the team at gunpoint. When he insults them, they attack and kill him, scans his and the team's retinas and open the rift. After Jack revives himself, they discover that Bilis has manipulated the team to open the rift, in order to release Abaddon, a creature similar to the Beast, 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, seemingly for good.

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