Author's Note: So I decided to just go ahead and make a second series. This first chapter will be in third person, and the rest will be in a Jen's P.O.V.. I don't own SPN, and please let me know if you think I should continue this! : )

Update: I originally wrote this on another fanfic, but I just decided to add to this one. Sorry for the confusion, but I hope you still enjoy!

"Dean, look out!" Sam yelled right before Dean was thrown into the wall by a poltergeist.

"Thanks for the warning now." Dean muttered as he tried to get back up.

The ghost they were hunting had been Richard Wells, a soul who sought revenge for his family and himself. The Winchesters had found out the Wells Family had been brutally murdered, and Richard's ghost killed anyone who had such hatred in his heart like his killer had. Unfortunately, brothers Sam and Dean had gotten in a heated argument, which summoned the ghost.

"Need a little help here, Cas!" Dean yelled out loud, hoping the angel would hear him.

Castiel suddenly appeared, a bit confused by the situation at hand. What none of them knew was that the poltergeist was somehow charging up an electrical force, the exact same thing that had killed his other victims. And his newest target was Castiel. Before the angel could move out of the way, something suddenly appeared in front of him.

"Cas, look out!" The person yelled before being thrown into the wall by the electrical force of energy.

Sam, Dean, and Cas stood in surprise over what had just happened before being brought back into reality by a loud groan. They went to run over to her, before pausing again in shock.

"Jen?" Dean muttered quietly.

There she lay, the girl that had died a year ago in an old warehouse. The girl that had died to make sure Lucifer never harmed the Winchesters and herself.

It was Jennifer Collins.

Dean slowly walked over to her unconscious body, and picked her up. He looked at her with pain and joy in his eyes, and he struggled not to let a tear slip down his face.

"Ah, so I've seen you've met the newest addition." a voice said from behind team free will.

"What are you doing here?" Sam asked, as they all turned around to see Crowley standing there.

"I'm here to retrieve that." Crowley pointed to Jen, almost looking disgusted.

"No." was all Castiel could mutter. "She can't be."

"Your brother thought you might say that."

"What the heck is that supposed to mean, Crowley?" Dean asked him angrily.

"I don't have time to explain, Squirrel. Just hand her over, and I'll go." He said.

"You are not laying a hand on her." Castiel commanded, with a look that would frighten any human.

"Your brother also warned me that you would say that as well, which is why I must inform you that your sister is not who you think she is anymore." a smirk formed on Crowley's face.

"What has he done to her?" Dean interrupted, trying not to show his concern.

"Well Lucifer had to bring her back somehow, he couldn't just leave her dead. So why not bring her back like one of us?"

And that's when all of their hearts sunk, because they know what that meant.

"You're not saying-" Dean started.

"Yes, I am saying that Jennifer Collins is a demon now. And don't think you can find a way to make friends with her. Lucifer's made sure that her one goal is to kill every single one of you."

"Then why did she just save Cas?" Dean yelled, having to stop himself from sounding weak.

"I guess she had just a little good left in her, but when she wakes up." A cruel smile tugged on his lips. "You better run like hell."

Dean looked down, and saw how peaceful she looked in his arms. But he also knew Crowley wasn't lying. Whether she liked it or not, Lucifer had control of her, and he could make her do whatever he pleased.

"Don't do it, Dean." Sam said, looking at his brother. "We can find a way to cure her, alright?"

Crowley shook his head, "I'm sure Lucifer we'll make sure you see her again. But I honestly do have your best interest in mind, and he has made her a monster."

"We have to leave her, Dean." Cas unexpectedly said, causing them all to look at him in surprise. "I know my brother, and I know he brought her back just to torture us."

Dean looked at Sam, waiting for him to say other wise, but Sam just sadly shook his head.

"You make sure we see her again you son of a-" Dean started to say as he carefully layed Jennifer back on the floor.

"I know." Crowley interrupted.

And with that, he disappeared taking Jennifer with him.

"You don't honestly think she's a demon, right?" Sam asked, trying to be somewhat optimistic.

Castiel looked at him with pain in his eyes, "Crelius thought she was dying to protect us, but now Lucifer's turned her into a weapon."

Dean just stood there in silence, trying his best to understand what had happened. As hard as he tried, he couldn't. Jennifer had been like a little sister to them, and had been their friend.

"We have to get her back." He muttered.

"Don't worry, we're going too." Sam said, placing a hand on his brother's shoulder. "We're gonna get our fallen angel back."

"That's just it, Sammy." Dean looked at him painfully. "We tried our best to forget about her, so that we wouldn't be haunted by those memories of her being dead. She might have been the fallen angel back then, but she's not anymore, alright?"

He paused.

"We forgot about her, Sam. Because of us, she's now the forgotten angel."