Future Cole is the avatar. Past Cole is Belthazor. Cole is the fused Cole. Didn't see the episode where Andy died, so I'm making it up. Piper and Leo are already married. Sorry if it isn't exactly like the Charmed timeline. Don't know Darryl's wife's name, so I'm calling her Denise. I don't know Cole, Phoebe, Prue and Andy's full names, so I'm making that up as well. Paige's powers weren't bound, she just didn't know she had them, and the only powers that worked involuntarily were her orbing powers when she was really scared.
Outside the manor, Future Cole appeared with another avatar.
"You must not do this." said the avatar.
"I have to. Things were better when Prue was alive. I'll teach Paige how to use her powers, and she'll join the others, becoming the power of 4. Then Phoebe and I may have a chance, and so will our son." said Future Cole.
Future Cole waved his hand, as time changed, and the other avatar vanished. It's now 1 year before Shax attacked.
On the streets Prue, Piper, and Phoebe are running down the streets. Past Cole shimmers in.
"I got Andy to safety. Hurry. If the demon finds him- oof."
Past Cole is interrupted, as he is flung into the wall, by the demon they are after.
"You will not kill my boyfriend." yelled Prue, who flung him into the alley wall.
The 3 sisters said a spell, and vanquished the demon. Past Cole shimmered them back to the manor.
At a social workers' office, Paige Matthews finished her work, and left. Future Cole appeared, nearby, and walked up to her.
"Hi, I'm Cole Turner. I know your birth family, and I want to explain some things to you." said Cole.
Cole grabbed Paige's left arm, and vanished with her.
In another dimension, Cole and Paige appeared.
"Where am I?" asked Paige, angry, and a little scared.
"Listen. Your sister are witches. You're their half-sister. You're half- whitelighter and half-witch. You have the power of telekinesis, healing, and orbing. I'm going to show you how to use your powers. When you're done, you'll be back on Earth, and no time would have passed. Just remember to join the Halliwells when this is over." said Future Cole.
"Alright. Let's say I believe you. How come I haven't had these powers before?" asked Paige.
"You have had your whitelighter powers from the beginning. Your parents' car accident. Ever wonder why you were saved and they weren't. You orb unconsciously when you're scared. So, you were free from the blast when it took full affect." said Future Cole.
"Alright then. Let's try out these powers of mine." said Paige.
In the next few months, Future Cole trains Paige how to use telekinesis, healing, and orbing.
"Now, that you're mastered these powers, you have to help Piper, Prue, and Phoebe. Remember what I've taught you, and told you about the future. Try to prevent some of the bad things that happened, so you and your family can live happy. If this works, I'll cease to exist. But at least Phoebe will be happy." said Future Cole.
"Wait. Come with me. Maybe you could merge with the other Cole somehow." said Paige.
"Alright. I've got nothing to lose." said Future Cole.
Future Cole and Paige grabbed hands, and vanished.
Back in San Francisco, Paige and Cole appeared, and walked to Paige's car. They drove to the manor.
At the manor, Prue, Phoebe, Cole, and Leo were looking through the Book of Shadows. Andy was back at work, and Piper was downstairs cooking. Phoebe looks outside, and is shocked to see Future Cole, and Paige coming to the door.
"You guys, another Cole is walking up to the house with a redhead." said Phoebe.
"Go check with the Elders." said Prue.
Leo nodded, and orbed out.
Downstairs. Piper hears the door knock, and walks to it to see Future Cole and Paige. She opens the door.
"What can I do for you?" asked Piper.
In the attic, the group hears Piper open the door.
"What can I do for you?" asked Piper's voice.
"PIPER!" yelled Prue and Phoebe, running down the stairs followed by Past Cole.
Downstairs, Prue, Future Cole, and Paige are sitting on the sofa. Prue, Phoebe, and Past Cole entered the room..
"Does Andy know about your secret?" asked Paige.
"Yes. I just told him today, and a demon almost killed him." said Prue.
"I know. I stopped that from happening. I was holding the demon back, while you vanquished him. And before you start with the questions and stares, I was invisible. I'm an avatar in the future." said Future Cole.
"An avatar? That's pretty powerful. More powerful than the Source and the Elders combined." said Past Cole.
"Listen. This is Paige, your half-sister. Her father is Sam, your mom's whitelighter. I know it'll take some getting used to, but you guys need to become the power of 4, so your children will be safe." said Cole, eyeing Piper and Phoebe.
"You mean I'm going to have a child." said Piper.
"Yes, well before Paige, came your future was a daughter, named Melinda. In my time, you had a son, named Wyatt Matthew Halliwell. I've said to much about the future. Paige knows more, but can only say it close to when it happens. I can't have the future altered drastically. It might kill 1 of you, and I worked so hard to keep you 4 sisters together with Andy, Leo, and my past self. I don't want that to be ruined." said Cole.
"Welcome to the family, Paige." said Piper.
Leo orbed in, and they explained everything to him.
"Well, Paige is your half-sister, and Cole is from the future, and is an avatar." said Leo.
"Paige gave me the idea that I merge with my past self. Surely the avatar powers will be stronger than Belthazor's powers, and we'll be able to protect Phoebe and the others from the Source." said Future Cole.
"Let's try it." said Past Cole.
The 2 Coles grabbed hands, and merged together. Cole now has the avatar powers.
"I wonder if our son will be half-avatar, and half-witch." said Phoebe.
"Probably." said Cole.
"Cole, you know we can't tell anyone about the future that might happen, in case it does happen, otherwise, we'll change the future, which might be worse than what the Future Cole came from." said Paige.
"She's right. We don't need to know about the future, until it's the present." said Prue.
"Andy, our wedding's tomorrow. We have to get ready." said Prue.
"So is ours. It was great to have a double wedding." said Phoebe.
The 2 couples went upstairs to get ready for the weddings tomorrow.
"Piper, I heard from Cole that you're a great chef. I can't wait to try one of your meals." said Paige.
Piper laughed, and the 2 sisters walked into the kitchen to make dinner.
The next day, at the church. Paige, Piper, Leo, Darryl, Denise, and Victor are among the crowd. Patty and Grams are there, invisibly, only Victor, Leo, Darryl, Denise, Leo, Andy, Cole, and the 4 Charmed Ones could see them. Prue and Andy walked up to the altar.
"Andy Michael Thoreau, will you take Prudence Anne Halliwell to be your lawful wedded wife? To have and to hold. To love and to cherish, in sickness and in health, as long as you both shall live?" said minister.
"I do." said Andy.
"And do you, Prudence Anne Halliwell take Andy Michael Thoreau, to be your lawful wedded husband? To have and to hold. To love and to cherish, in sickness and in health, as long as you both shall live?" said minister.
"I do." said Prue.
"If anyone objects to this marriage say so now, or forever hold their peace." said the minister.
No one objected.
"Then I now pronounce you husband and wife. You may kiss the bride." said the minister.
Prue and Andy kissed, and walked down the aisle, and sat down in the pews next to Piper and Leo. Phoebe and Cole walked in, and stood in front of the minister and the altar.
"Cole Benjamin Turner, will you take Phoebe Patricia Halliwell to be your lawful wedded wife? To have and to hold. To love and to cherish, in sickness and in health, as long as you both shall live?" said minister.
"I do." said Cole.
"And do you, Phoebe Patricia Halliwell take Cole Benjamin Turner, to be your lawful wedded husband? To have and to hold. To love and to cherish, in sickness and in health, as long as you both shall live?" said minister.
"I do." said Phoebe.
"If anyone objects to this marriage say so now, or forever hold their peace." said the minister.
No one objected.
"Then I now pronounce you husband and wife. You may kiss the bride." said the minister.
Phoebe and Cole kiss. Prue and Andy stood up, and the 2 couples walked down the aisles, and out of the church, followed by the guests. They all headed to the church hall.
At the church hall, Prue, Andy, Phoebe, Cole, Piper, Leo, and Paige are there. Sam Stuart walks in, and Paige drops her plate to the floor, which smashes into pieces.
"Hello, Paige." said Sam.
"Dad?" asked Paige.
Sam nodded, and she ran up to him, and hugged him. Patty and Grams hugged Paige as well. Piper swept up the plate pieces, and put them in the trash.
"We have to go girls. Our time is up." said Patty.
Patty and Grams vanished in white sparkles of light. The rest of the guests arrived.
"It was nice to meet my family. (to Sam): "I want to get to know you more, too." said Paige.
"I also want to get to know you more. I also have 2 honeymoon tickets to Hawaii, and 2 to the Bahamas. Who wants what?" asked Sam.
"Thank you. You didn't have to do this, but we'll take Hawaii." said Prue.
"We'll take Bahamas." said Phoebe.
Sam handed them the tickets.
"The flights leave tomorrow morning, so have fun, and go enjoy your honeymoons. I want to spend some quality time with Paige, though." said Sam.
"See you guys later." said Paige.
Paige and Sam exited the church and orbed out.
The next day, Prue and Andy boarded the airplane for Hawaii. Phoebe and Cole boarded the plane for the Bahamas. Paige and Sam are spending time together in LA. Leo is busy with other charges, so Piper is left alone at the house.
In the Underworld, a robed figure had watched as the Charmed Ones had separated.
"Yes. The Charmed Ones are spread out. Time to take down the freezing witch before her whitelighter husband or witch sisters return." said a robed figure, who then flamed out.
At the manor, the robed figure flamed in, and walked towards the kitchen. In the kitchen, Piper heard someone enter.
"Leo? Paige? Did you guys come back?" asked Piper.
Piper walked into the hall. The robed figure walked up behind Piper, and knocked her out with a vase. Laughing, he flamed out with her.
In the Underworld, in a room with no door or window, and the only overhead light is from a lantern from above. Piper is chained up, and awakened to see the robed figure.
"Who are you?" asked Piper.
"I'm the Source." said the figure.
The figure removes his hood, to half half-human face, while half his face is covered up by a mask. The Source then flamed out laughing, leaving Piper trapped.