"Bad Wolf" is the twelfth episode of the revived first series of the British science fiction television series Doctor Who, which was first broadcast on 11 June 2005. The TARDIS crew find themselves trapped in the Gamestation, also known as Satellite 5, where they must battle to survive the cruel games. However, when Rose is taken away, the Doctor realises his deadliest enemies have returned en masse.

It is the first of a two-part story. The concluding episode, "The Parting of the Ways", was first broadcast on 18 June 2005.

The Doctor, Rose, and Jack Harkness find themselves separated, waking up with temporary amnesia in various television game shows. The Doctor finds himself in a Big Brother house hosted by the Davinadroid, Rose ends up on the set of The Weakest Link hosted by the Anne Droid, and Jack wakes up facing two female androids who offer to give him a makeover on a show similar to What Not to Wear. All three find out that the shows are more fatal than their twenty-first century counterparts. On The Weakest Link and Big Brother, losing contestants are disintegrated. On What Not to Wear, participants undergo brutal cosmetic surgery. The Doctor escapes from his show, bringing along a contestant called Lynda. They discover that they are on Satellite Five, which the Doctor previously visited in "The Long Game". It has been renamed the Game Station and is now under the control of the Badwolf Corporation. Lynda explains that 100 years ago, Satellite Five stopped broadcasting and humanity became confused and lost.

The Doctor, Jack, and Lynda search for Rose. They find her just as she loses the final round of The Weakest Link and is promptly disintegrated. They are arrested, but escape their capture and travel to the control room on Floor 500. There they meet the Controller, a cybernetic human. The Controller uses the cover of a solar flare to speak directly to the Doctor, telling him that her masters cannot hear her during the flare. The Controller used a transmat to hide the Doctor and his companions in the games as her masters do not watch them. The solar flare ends before she can tell the Doctor who is controlling her. Jack finds the TARDIS, which he uses to figure out that contest losers are not actually disintegrated but transmatted off of the station. The Controller begins giving the Doctor the coordinates that the transmat leads to, knowing that her masters will hear. The Controller disappears in a transmat beam and wakes up on a spaceship, where she is killed by her masters. Rose wakes up on the floor of a spaceship and is horrified to see a Dalek approaching her. The Doctor and Jack discover a signal coming from the station that is hiding something at the edge of the solar system. They cancel the signal and reveal a fleet of Dalek spaceships. The Daleks open a communication channel to the Doctor, threatening to kill Rose if he interferes. The Doctor refuses to back down and vows to rescue Rose and wipe out the Daleks.

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