Hey! So this would be my second fanfic and my first crossover so please be patient and just pm me or review if you find anything that I missed. Please review! It's what makes me want to write more soooooo ya. Anyway enough babbling enjoy!

Disclaimer: I OWN NOTHING!

Watchtower, Earth's Orbit

"So, what do you think the mission's going to be?" Supergirl asked the tall strongly built man clad in a red spandex with a white hood that lead down to a white cape, a lighting bolt on his chest, Captain Marvel, on their way to the teleporter room for deployment. They had just been called by J'ohn J'onzz, the Martian Manhunter, for a mission and were to be deployed to earth as a team. They were walking down a long corridor, it had a metal floor and ceiling, one wall was metal much like the floor and ceiling but the other was breathtaking. It was glass from floor to ceiling and on the other side, was one of the most breathtaking sites imaginable. The entire earth was visible. After all, the watchtower was in space.

"I don't know, why do you think they need both of us. Doesn't this seem like overkill for an escort job?" The Captain asked curiously towards the Shorter blond haired beauty that was walking next to him.

"Well whatever it is, it has to be important if they need both of us." Supergirl said

"But if it's that important why didn't they just ask Superman or Captain Atom? Why the two of us?" He said as they walked in two the teleporter room where they met J'ohn J'onzz. He stood at aroung 6 deet seven inches, he was lean but had very clearly defined muscles. He wore knee high blue boots and a blue speedo. He had two red straps on his chest that shaped an "X" and had a long blue cape.

"Most of the other leaguers are out on missions, the two of you are the only ones who are free at the moment, I must remain here to coordinate the league." The Manhunter said without emotion.

"Ok, no issues here. What about you?" Captain marvel said turning to Supergirl

"No, I was bored anyway. What are we doing J'ohn?" She asked turning to the green martian.

"You will be escorting a S.T.A.R. labs convoy on it's way to it's testing area. It is a simple mission and it should not take very much time." He said completely emotionless not even looking away from the screen in front of him.

"Ok no problem." Supergirl said as she made her way to the teleporter. "Are you coming Captain?" She teased as Captain Marvel made his way to the teleporter immediately after her.

Earth: Somewhere between Metropolis and Gotham

Both Supergirl and Captain Marvel were flying above the convoy. A large 18 wheeler with 2 military style jeeps, one in front and one behind.

"So this is going well." Captain Marvel said trying to strike up a conversation.

"Ya this is pretty easy I don't know why they wanted us for it." Supergirl said while easily soaring above the convoy.

"I guess whatever is in that truck has got to be pretty important." Marvel said eying the truck below them.

"Knowing S.T.A.R. Labs it's probably some new weapon." Supergirl said with a hint of anger in her voice.

"Still mad about the whole cloning you thing?" Marvel asked knowing the response he would get in advance. "That was a long time ago Kara." He said with a wisdom beyond his years.

"Of course I'm still mad, they cloned me! Not to mention they had my clone attack and cripple the watchtower." She said the anger in her voice becoming more and more evident.

"Kara, take it from me. You can't let the actions of few cloud your judgment of many. I didn't exactly have the best childhood, but look where I am. I didn't let that stop me from becoming the hero I am today." He said recalling some of his memories from foster homes. A single tear escaping his eye.

"I'm sorry Cap, I didn't mean to touch a nerve. It's just I don't trust them. That truck is lined with lead, I can't see into it. Why would they be trying to hide it from me." She said the anger now turning to suspicion.

"Maybe it isn't you they're trying to hide it from." The Captain said trying to ease her suspicions.

"Maybe your right. I mean they obviously needed us for something right?" She said finally agreeing with him.

As if on cue a large explosion destroyed the road about 50 feet in front of the convoy. It was quickly followed by a similar explosion 50 feet behind it as well. The convoy was trapped.

Out of the smoke two figures were seen approaching. One was a tall muscularly built man with a skull engulfed in green flames for a head, the other was very tall and had the physique of a god. He wore a back suit with a lighting bolt on his chest.

"Atomic Skull and Black Adam, why am I not surprised." Supergirl said, her eyes glowing red.

Suddenly Black Adam bolted towards one of the jeeps pulling the the driver and passenger out and holding them by their throats.

"If you even dare to move towards us I will crush these two like the insects they are." He said without any remorse. "Now Skull go and get what we came for." As if on cue, the Skull walked towards the back of the 18 wheeler and ripped off the doors. They revealed a single object held in place by countless harnesses and chains. It was no bigger than a basketball. It was simply a metallic box with blue lines running all over it. Skull lifted it above his head and walked over to Black Adam.

"We won't let you do this!" Supergirl yelled as she shot her heat vision right at Black Adams forehead causing him to drop the two unconscious hostages which Supergirl then rescued at blinding speeds.

Just as she did this captain marvel,using the speed of Mercury, landed a punch on the Atomic skull sending him sprawling 50 feet back throwing the device up in the air. Captain Marvel swiftly flew up and caught it immediately flying over to the other flipped jeep to check on the occupants. He set down the device and pulled out the occupants. One had a few broken bones, the other was unconscious but otherwise fine, and the third was a scientist. His right leg was horribly mangled and he was in a lot of pain.

"Are you alright?" Marvel asked the still conscious doctor.

"Ill live, but you can't let them get that machine." The doctor said starring at the box with regret.

"What's inside?" Marvel asked with a hint of childish curiosity.

"That's classified!" The conscious soldier said abruptly.

"Don't you think I should know what I'm protecting?" Marvel asked annoyed with the soldier.

"It's called a Multidimensional Electric Generator. They were supposed to solve the worlds energy crisis. One of those boxes could power both North and South America for 50 years before a new one would be needed." He said sadly

"But something happened, didn't it?" Asked Marvel already knowing the answer.

"Yes, they could just as easily be used as a weapon. That's why were moving it, it is going to be destroyed and the plans decommissioned. Because it can be used as a bomb. It works by feeding off the excess energy that's created when a trans-dimensional rift is opened. Unfortunately, we couldn't close it, and when that happened the energy readings went off the charts..."

"...And that's when someone came up with the idea to use it as a weapon." Marvel finished the scientists sentence.

"Exactly." He said in a defeated tone. "The worst part is that we never managed to close the rift. That's what the box is, a containment unit." He said looking towards the box again.

"So your saying that inside that both is a hole in between dimensions?" Marvel asked surprised.

"That's exactly what he's saying" Said a voice that Marvel knew all to well.

"Luthor, I should have known these two could't pull this off alo..." Marvel instantly froze when he turned around. Luthor was standing their with Black Adam and the Atomic skull right behind him, he was holding a badly beaten Supergirl by the hair, a kryptonite collar around her neck. "Oh my God..." Marvel said out of fear the Supergirl's life.

"Now my lovely associate Black Adam has informed me that you have a certain phrase you should remain from saying."Luthor said smugly. "Speak the words or she dies!" He said sadistically.

"C..Captain, don't." Supergirl said weakly.

"Shazam." The captain said quietly, a loud sound echoing as an enormous bolt of lighting hit him, transforming him into a 16 year old boy.

"Isn't that better?" Luthor asked grinning sadistically. "Now bring me the box, and if you try anything I'll kill her." He said with a serious tone.

Billy slowly walked over to the small box and picked it up. He cautiously walked over to Luthor who was holding Kara by her blond hair. He slowly looked at Luthor with a defeated look in his eye while gripping the box tightly in his arms. He was within a foot of Luthor.

"Now give me the box." Luthor said in a condescending tone.

"...No..." Billy whispered.

"What was that?" Luthor said. "Speak up boy!"

"I said NO!" Billy yelled kicking Luthor in the groin causing him to let go of Supergirl. "SHAZAM!" He yelled as a lighting bolt came down at blinding speeds. He had barely enough time to grab Supergirl's arm just as the lighting bolt hit. But just as hit hit, the magic power from the bolt covered Billy Supergirl and the box. And suddenly the God-like form Captain Marvel could be seen holding the box and Supergirl.

"y...you fool" Luthor said with fear in his voice. "Look what you've done!" Luthor said turning to run away motioning for Black Adam to get him and the Atomic Skull as far way as possible.

"Luthor, what about the box!" said the skull.

"Would you rather the box or your life?" Luthor said while Black Adma was carrying him and atomic SKull by the wrists at high speed away from the area.

"I wonder what has him so afraid?" Marvel said thinking out loud. He then noticed that the box in his hand had a crack in it, and before he could react a white light came from the box and engulfed him and Supergirl and suddenly they were gone. It was as if they had been sucked inside. As the box fell to the ground it shattered upon impact. The metal pieces crumbling revealing nothing inside.

Watchtower: Earth's Orbit

"Captain Marvel! Supergirl! Come In!" J"ohn was alone in the teleporter room yelling into the comms system, it wasn't often but for the first time in a long time emotion could be seen on his face. He was about to contact other league members for assistance. He didn't notice the golden ankh appearing behind him. Through the glowing golden ankh stepped a figure clad in a blue suit with a golden belt, golden gloves, boots and a golden helmet.

"I can no longer sense them." he said from behind J'ohn

"Have they died?" J'ohn asked fearfully

"No, it's as if they were erased from this reality. I cannot even track where they went." He said in a defeated tone.

A Dark Forest: Unknown Location

Two costume clad figures lay nest to each other on the ground unconscious. A large man with a God-like physique and and smaller fragile looking woman with a glowing collar around her neck.

"Uuuggghhh." Marvel said as his eyes slowly started to open. "What happened?" He thought out loud. "Last thing I remember I was holding that box and... KARA!"