Parallel World

The Alternate Reality
The alternate reality was shown in It's a Bad, Bad, Bad, Bad, Bad, World parts 1 and 2. In this alternate reality, evil prevails over everything. The Underworld has become a heavenly place, or a sanctuary for good, and the world the Evil Charmed Ones live in, has become the Underworld of the Good Charmed Ones world. The two worlds mirror each other when in balance. It is believed that the Book of Shadows is evil here, and has become much like the Grimore of the other world. The Charmed Ones of both worlds once met each other except for good and evil Piper. When in combat, the two good Phoebe and Paige, and the two evil Phoebe and Paige could not vanquish each other because they think alike.