The Charmed Ones help out Leo's mentor, Gideon, when he wants to find out who cast the spell of darkness over a magic school and conjured the headless horseman who has been beheading the teachers. Meanwhile, Phoebe goes on a vision quest.

Gideon makes a deal with the Darklighters to get rid of Leo, but they accidentally send Leo and Piper to the Ghostly plane, leaving Phoebe and Paige to believe that they are both dead. Meanwhile, Chris begins to disappear and reveals that he must be conceived before the night is over or he will vanish forever.

When Piper is kidnapped and cocooned by the Spider Demon, and becomes Chris infected with the Demon's venom, causing him to mutate into a spider, Paige, Phoebe and Leo try to rescue them. Meanwhile, Leo finally learns why Chris resents him.

When Phoebe and Paige are caught on tape using their powers, the Cleaners, cover up the situation by implicating Darryl as a murderer. When the sisters try to help, they end up on trial instead. Meanwhile, Leo and Chris work together to help free the sisters and Darryl.

Under the pressure that the Halliwell sisters will discover his evil plot, Gideon conspires with two demons to make Piper, Phoebe and Paige part of ""Witch Wars"", a new demonic reality television show where demon contestants compete in a series of contests to hunt down the Charmed ones.

Gideon creates a portal that puts Chris and Leo in a mirrored world where evil prevails, and Phoebe and Paige travel to the parallel universe to rescue them. Meanwhile, Piper gives birth to baby Chris.

Gideon creates a portal that puts Chris and Leo in a mirrored world where evil prevails, and Phoebe and Paige travel to the parallel universe to rescue them. Meanwhile, Piper gives birth to baby Chris.