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After they were confronted by the warlock Nicholas in 1999, the charmed ones traveled back in time to 1975 to prevent their mother from making a deal with the warlock. After they obtained his ring that made him immune to their powers, Penny and Patty attempted to send them back. However, the spell failed as it required the Power of Three. A pregnant Patty then cast the spell with the little Prue and Piper and managed to send them back.
A time for everything,
and to everything its place
Return what has been moved
through time and space.