- Leo: …we don't have the Power of Three to open the portal.
- Phoebe: No, but we do have…
- Evil Phoebe: The Power of Four.
Phoebe, Paige and Their Evil Counterparts
The Power of Four was only used once in the series in Season 6, in the episode It's a Bad, Bad, Bad, Bad World, where in an alternate universe Phoebe and Paige had to team up with their evil counterparts in order to stop Gideon from killing Wyatt Halliwell. They then cast another spell together to open the portal back to their original world.
All Four Charmed Ones
In the Season 9 comics, "The Heavens Can Wait", "Family Shatters", and "Four's Company", it is stated that The Power of Four (as in all four Halliwell sisters) cannot exist. Melinda Warren didn't foresee a Power of Four; Prue and Paige share one of Melinda's powers and Piper and Phoebe have the other two. If the four Halliwell sisters were ever to be together, it would not make them stronger; instead it would weaken the power of the Charmed Ones.
Prue Halliwell finally returns from the dead and is reunited with her three younger sisters, but their reunion turned out to be a bittersweet one as Prue ended up having to strip her own powers as having the four sisters connected caused cataclysmic results due to the prophecy only referring to three sisters and not four.
The sisters and their parallel selves create the following spell, invoking the Power of Four to destroy Gideon.
- We call upon the Ancient Lore
- To punish with the Power of Four,
- Strike down this threat from both there and here,
- Make him suffer, then disappear.
Notes and Trivia
- The Power of Four concept as addressed in season 9 was originally created by fans of Charmed, hoping that Shannen Doherty would reprise her role of Prue Halliwell. It was thought that the Power of Four would be stronger and far greater than The Power of Three due to the Halliwells' powerful half-sister Paige Matthews.
- When Prue gained all of the Charmed Ones' powers, including her own, it can be considered that she herself is The Power of Four, but in the form of the Power of One.
- In "The Demon Who Came in From the Cold", the sisters and Leo were discussing what movie to watch. Leo and Piper sided on a thriller while Prue and Phoebe were opposed to it, causing Piper to say "Welcome to the Power of Four" as a joke.