The Power of Four… Forever

 "Act I – Survival & Revelation

The film opens right after the Season 3 finale battle. Prue lies near death, but Cole Turner, defying his demonic nature, channels his power to hold off Shax long enough for Leo to heal both Prue and Piper.
This act redeems Cole in Phoebe’s eyes, proving his love and loyalty.
Peace doesn’t last long. Phoebe receives a cryptic message from the spirit board: “Save Paige.” None of the sisters know what it means.
Cole goes undercover, re-embracing his demonic persona, and discovers the Source has captured Paige Matthews—their secret half-sister.
Act II – The Lost Sister
The sisters summon Penny and Patty Halliwell for answers. Patty reveals the truth: Paige is her daughter with Sam, hidden to protect her. Paige is family.
Meanwhile, the Source manipulates Paige, tempting her to evil by forcing her into a choice: to truly fall, she must kill willingly.
Rescued by her sisters, Paige seems safe—until her eyes darken with evil’s grip. She nearly kills Phoebe, but a vision of her mother restores her true self.
The Power of Four is born.
Act III – Trust & Betrayal
Prue struggles to accept Paige, feeling her bond with her original sisters is threatened. Leo helps her understand Paige’s fear, reminding her that family means guiding the lost, not rejecting them.
The Source plots revenge, targeting Cole, knowing his death would shatter Phoebe. Phoebe begs Cole to renounce his powers and become human, but he refuses—his priority is protecting her.
The Source seeks the ultimate weapon: The Hollow. Even his demons fear it.
Act IV – Time Twists & Destiny
In the battle against The Hollow, Paige is gravely endangered—but an unexpected ally arrives: Chris, a mysterious young man from the future.
Leo distrusts him, sensing something familiar. The truth unravels when Bianca, a Phoenix assassin, arrives to drag Chris back. In the struggle, Chris confesses: he is Piper’s son from the future. He came back to save his family because in his timeline, his older brother Wyatt turns evil and destroys them.
The revelation shakes the sisters, but they embrace Chris. Leo, holding back tears, calls him “son.”
Act V – Family vs. Fate
The Source allies with Zankou to harness Wyatt’s future power, dragging the evil adult Wyatt into the present. The sisters face not only the Source’s army, but Piper’s own corrupted child.
In a heartbreaking sacrifice, Bianca gives her life to protect Chris, proving her love.
With the Power of Four, Cole’s sacrifice, and Chris’s guidance, the sisters channel all their strength to defeat the Source, Zankou, and banish the Hollow forever.
Evil Wyatt is cast back into the timestream, leaving hope that the future can change.
Act VI – Healing & Hope
The Halliwells rebuild. Piper learns she’s pregnant, carrying the child she now knows is Wyatt.
Chris, knowing the timeline is already shifting, says goodbye—but not before Leo promises he’ll never let him or Wyatt walk down a dark path.
Phoebe and Cole finally wed in a beautiful, magical ceremony, witnessed by family, friends, and spirits.
Prue receives a visit from Andy, now a Whitelighter. He tells her how proud he is and that embracing Paige was her greatest act of strength.
The movie closes years later: Piper and Leo welcome baby Chris into the world. The sisters stand together, stronger than ever, as the camera pans to the glowing Book of Shadows, its final page reading:

“The Power of Four… Forever.”"