After Phoebe tells Piper and Paige that she's pregnant with Cole's child, they team up with a wizard in an attempt to stop the Source before he ascends to power. However, they are unaware that Cole is now the new Source and that once his coronation takes place, Phoebe will take her place as the new Queen of the Underworld.

After banishing Cole, Phoebe's baby begins having strong demonic powers while still in the womb. As a result, the baby starts signs of open hostility toward Paige and anyone else who speaks ill of his father. What happens next is that the Seer takes it upon herself to steal the demonic baby from Phoebe and ultimately gain its power as heir to the Source.