Author's Notes: This is my first fanfic of my favorite tv show. I don't own it. Just my OC who is also Danny's younger sister. If you like this you'll love future chapters as I am working on getting Chapter 1 up soon!

Danny sighed. It was supposed to be a quiet evening watching movies with his friends. "Just great. You guys stay put-"

He was cut off "And watch Jenny we know." Sam said. Jenny was Danny's younger sister, a twelve year old girl. And right now she was sneaking down to the lab. She wasn't into catching ghosts. If anything she wanted to fight alongside Danny Phantom. Her shoulder length dark brown hair blew in her face. Weird cause there was no wind. Her brown eyes locked on the machine that unbeknownst to her, made her older brother the ghost she idolized. It was a ghost portal.

"Now how do I get it to work?" She thought aloud. Looking around she saw it was plugged in. Jenny just wanted to be like Danny Phantom who she knew to be her older brother, Danny Fenton. "If I become like Danny, I can help him out. Maybe get some serious training so I don't just hide during a fight." she said. She turned her back on the portal to the ghost zone. She regretted it right away. The Box Ghost got loose. "Oh um hi I guess." She said to the ghost. She grabbed the Fenton Thermos and sucked him up in it fast. "Bet you thought you'd never get caught by a girl. Ha! Well you go back and find a box in the ghost zone to chill in." The Box Ghost could never be her friend. Too annoying.

She turned her back as more ghosts started coming through. She knew one of them and wasn't actually scared. Skulker was backing Jenny up against a wall. "Did you say you want to be like Danny Phantom? I couldn't tolerate that."

He smirked as he attacked the girl and was annoyed when she was clever enough to avoid him. She quickly texted Danny "Ghost in the lab. Sorry I snuck out of my room." She glared at Skulker and ran towards the ghost portal.

Skulker tried to attack Jenny. She did a backflip and realized the fight needed to be taken outside. Skulker punched her before she could dodge and sent Jenny flying into the machine. The punch sent her flying into the ghost portal and started it up. Groggy, but still ready for a fight she saw Danny Phantom standing between Skulker and her. Danny looked somewhat worried. "You okay?" He asked.

"You wanna ask questions or you wanna kick some butt!" She said as she turned ghost. White hair, green eyes and a suit like Danny's was what made her different from being human.

Danny's jaw dropped but that didn't stop him from defending his sister. "You're lucky it's a Friday night! I'll have to train you all weekend. You can't leave the house with no control over your powers." He lectured as they fought Skulker.

"Jenny, I wouldn't get too close." Danny said. Jenny tried to shoot a plasma blast at Skulker. It did nothing to him.

Jenny threw in a few punches and kicks."Wait so who else knows you're half ghost?" Jenny asked

"Not many people know. I wanted to keep a low profile. And keep my friends and family safe. That's why Tucker and Sam know…and Jazz..But only them. Mom and Dad don't even know." He wanted to hug his little sis and make things better but they still needed to get rid of Skulker . He grabbed a Fenton Thermos while Jenny kept Skulker busy by flying around but she was starting to get a bit tired.

The only thing keeping her going was she was mad and wanted to beat something up. "Wait so I can't tell my only friend about this…that sucks." She said as Skulker hit her, knocking her out of her ghost form.

Jenny sat up and examined herself. She should have been knocked out of her ghost form, not that she minded much. "I'm okay."

Jenny moved away as Skulker tried to attack her, Danny caught Skulker in the Fenton Thermos and sent him back to the Ghost Zone. "If you see him again you gotta run, not fight. Skulker is really strong. You need a lot of training." Danny said. "So wanna fly around for a bit? Tucker and Sam can wait a few minutes." Danny said.