Under the guise of sending Chris back to the future, Gideon creates a portal that puts Chris and Leo in a mirrored world where evil prevails. Phoebe and Paige travel to the parallel universe to rescue Chris and Leo, only to find themselves in a battle with their evil counterparts. Unable to vanquish one another, both sets of sisters realize that Wyatt is unprotected and in danger from Gideon. Upon returning to their own world, Phoebe and Paige realize that their world is now too good, and every little infraction is a capital offense. The shift between universes causes Piper's memory to be erased, and Gideon tricks Piper into casting a spell on Phoebe and Paige so that they too, forget Gideon's evil intentions. With the Charmed sisters under the spell, and Piper having a complicated delivery, only Leo and Chris are left to stop Gideon from completing his plan. When Chris is left alone with Wyatt in the attic, Gideon attacks just as Chris goes to orb Wyatt out after suspecting something was not right. Gideon summons an athame and disappears. Chris rushes to grab Wyatt, but Gideon reappears and he stabs Chris in the stomach. While Chris lies there wounded, Gideon takes Wyatt to the Underworld. Chris calls out to Leo. When Leo arrives he tries to heal him, but Chris tells him that it will not work because it was Gideon's magic and only he can stop it. He tells Leo to find Gideon and save Wyatt. Unfortunately, Chris dies, sending Leo into a rage. He discovers the inter-dimensional mirror, meets with his analog self and realizes to return balance, a great evil needs to be done in the Charmed One's universe, and when he goes to save Wyatt he kills Gideon while his other self looks on through the mirror which at the end they both destroy, so the universes cannot be linked again in the future. Wyatt is safe, and though future Chris is dead, baby Chris is born healthy.