Complete story — includes the ending
Piper makes a costume for Wyatt's school play but is patronised by another mother, Mandi. Mandi is in fact being possessed by a demoness who plans on getting Wyatt used to her and then taking him to a familiar place (magic school) where he will help her resurrect the Source of All Evil. Paige sees Dex kissing another woman, who turns out to be his ex-girlfriend. Paige speaks to the woman who says she and Dex had 'break-up sex'. So, Paige masquerades as the woman to confront Dex but finds out the woman often lies. Dex apologizes to Phoebe later, saying he probably shouldn't have stayed in touch with his ex. Meanwhile, Leo is educating Billie and the two visit magic school where they find demons. Billie returns to our world for power-of-three reinforcements while Leo stays with Wyatt. With Wyatt's help, the demoness has conjured the Source to life. Billie returns with the three sisters. Piper vanquishes the Source by dealing with the demoness; the two were magically linked.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Charmed season 8. HTML formatting and reference markers removed. · Content license