When Universes Collide

A/N: The beginning of the story will at first focus on Smallville and Supernatural. Buffy and the gang won't be appearing till later. The events in this story take place after the season 3 episode titled "Sin City" on Supernatural while taking place after the season 7 episode titled "Siren" on Smallville.

Dean sat uncomfortably in his seat while munching down on a hamburger. It had been a few days since Sam shot the Crossroads Demon, which didn't free him from his deal. Dean would never tell Sam, but he was scared, terrified even of being sent to hell. Of course the only bright side to Sam offing the demon was that now they could look for a way out of the deal without the Crossroads Demon offing Sam. All they have to do now is find the demon that holds his contract. "Oh this is going to be fun," Dean thought to himself in a hopeless manner. Just then Sam came walking into the boys' messy motel room just hanging up his cell phone. He was about to tell Dean something when he cut him off saying

"Where's the pie Sam?"

"What?" Sam asked

"You were supposed to go to the local Diner and get me some freaking PIE!"

"Ohhh. That pie." Sam said with a nervous look on his face.

"Sammy, have you ever once ever remembered the pie?" Dean asked with an annoyed look on his face.

"Ummm…" Sam started.

"Let me answer my own question by saying, NO. Every time there is always some ridiculous problem. The first time you got hungry on the way back. The second time you claimed the pie was food poisoning waiting to happen, all because the Diner had several health violations. And don't even get me started on the whole "Oh the pie was haunted" excuse Sam.

"Dean?"

"What!?"

BAM. Sam had drawn back his fist and punched Dean across the jaw.

As Dean was rubbing his jaw he asked, "What did you do that for!?"

"Now that I have your attention Dean we have a new case.

"We do?" Dean asked as he continued to rub his throbbing jaw.

"Yeah that was Bobby that just called me. He says he's found a hunt for us in a town called Smallville."

Dean suddenly choked on his burger at the mention of that name.

"Dean, are you ok?" Sam asked concerned.

"Yeah Sam it's just that. Ohhh man. That burger went right through me," Dean said as he rushed to the bathroom.

"Make sure you flush this time!" Sam called out remembering what happened the last time Dean had a Mondo Deluxe hamburger with everything-and they meant everything- on it. The smell was so bad they had to seal off that section of the motel.

Once inside the bathroom Dean splashed some cold water on his face as he panicked about returning to Smallville. Especially after everything he had done in the past. After a suitable amount of time had passed Dean exited the bathroom and saw that Sam had already packed and loaded everything in the Impala. He walked over to the stairs and saw Sam waiting for him.

"Hey Dean be careful on those stairs. They're kind of bad."

"Ok Sam. I'll be right there," Dean called out. He walked back into the room and took a deep breath hoping that no one would recognize him in Smallville. It had been almost three years. He then walked to the stairs, but was so focused on thoughts concerning Smallville that he failed to notice the bad step and went falling down the steps.

"Dean!" Sam shouted as he ran to his brother's side. "Are you ok?"

"Do I look ok?" Dean asked sarcastically with a look of pain on his face.

The Hospital

"So how bad is it Doc?" Dean asked sitting on the hospital bed with his broken leg.

"The damage isn't too bad," the doctor replied. "You should recover in a couple of weeks."

"Weeks!?" Sam and Dean said in unison as the doctor left the room.

"I guess I'll have to go it alone," Sam stated.

"Ok fine Sammy. But if I find one scratch on the Impala when you get back"

"Relax Dean," Sam interrupted. "I'll take good care of your baby." And then Sam left the room and drove off in the Impala. Dean breathed a sigh of relief as Sam drove off. He won't have to face the people of Smallville after all. But what exactly is he going to do for fun while he's stuck in this hospital. Dean was broken out of his train of thought by the sound of his door opening.

"Hello Dean. My name is Kaitlin and I will be your nurse for today."

An evil smile appeared on Dean's face. "Looks like I've found what I'm going to be doing for fun," Dean thought.

Smallville

After about an hours drive Sam arrived in Smallville "The Meteor Capital of the World" as the sign depicted. For his first week there Sam had luck that was as bad as Dean's GPA at school, which was nonexistent so that's really bad. He questioned a lot of people in town, searched through "The Talon", and tried the school as well but came up short. All the while people were dying left and right and there was nothing Sam could do. Most of the deaths were pretty gruesome. Some people were burned alive. Others had there skulls smashed in. But Sam never heard of any supernatural creature killing someone this bad before. As far as he knew only Yellow Eyes had the power to burn people alive and he's gone so what could be doing this. As Sam was walking back to the Impala parked outside "The Talon" he suddenly heard someone call out for help in a nearby alleyway. Sam grabbed his shotgun and ran into the alley. He saw a young man in a blue jacket and red t-shirt holding a man by his neck up to a wall.

"Help me!" The man shouted.

"Put him down!" Sam ordered as he ran to the man's aid and fired his gun. The bullets hit the killer but they didn't even leave a mark. The killer grabbed Sam by the neck and lifted him off his feet.

"Stay out of this," The mysterious killer ordered before throwing Sam against the other wall. Sam hit it hard and sank to he knees. He looked up just in time to see the killer burn the man alive. He let out a shriek of terror as his body was consumed by fire. The killer dropped him and looked to Sam with an evil smile on his face before taking off into the sky.

"That's right Dean not a scratch. This creature could even fly." Sam said as he walked back to the Impala.

"He could fly?" Dean asked not sure what to believe. "And I suppose he thought of a wonderful thought and applied a little bit of pixie dust."

"Dean I'm serious."

"What did this thing look like anyway?" Dean asked.

"Tall, Black hair, early twenty's, wore a red shirt and blue jacket."

"Clark." Dean thought. "You sure this wasn't demonic possession or maybe even a shape shifter.

"Dean if it were a demon it would have been hurt by the rock salt. And you know shape shifters aren't invincible. Looks like I'm going to have to use the colt on this thing.

"Alright Sam, but be careful."

"I will Dean. Make sure you heal fast. It's kind of boring out here without you," Sam said as he hung up.

"Clark Kent," Dean thought. "I always knew there was something supernatural about him. But he can't be the killer. He was a good guy. Even if we didn't see eye to eye Clark would never murder someone in cold blood." Dean continued to think. He wondered how everybody was doing back in Smallville. Clark, Jonathan, Martha, Lois and Chloe (those two in some ways were female versions of myself and Sam), and Lana (I honestly thought I had loved her, but just a week being out of Smallville I rejoiced that we we're no longer together).

As Sam hung up his phone and walked off he failed to notice that someone had listened to his entire conversation and was quite worried. Without a moment's hesitation she whipped out her cell phone and started dialing.

"Clark it's Chloe. We've got trouble."

The Kent Farm

"Slow down Chloe, you really think Bizzaro's back?"

"I know Lana blew him to kingdom come, but this isn't the first time one of your dead enemies came back to life.

"If he is alive Chloe he would have come for me. He was always intent on living my life, remember?

"Whoever that man was, his description of the killer matched Bizzaro's especially the ability to fly part."

"But it doesn't make any sense. The blue Kryptonite Lana used on him blew him up. Who lives through that?"

"Apparently Bizzaro. Speaking of Lana, whatever happened to her?"

"After Bizzaro things just weren't the same anymore. She packed her bags a week ago and I didn't do a thing to stop her. Whatever we had is no longer there." Suddenly Clark heard a car coming approaching. Stepping out of an Impala was a man in his early twenties. He scanned the area before heading for the barn.

"That's the guy who saw Bizzaro." Chloe informed Clark. "He must think Bizzaro's you."

"And he's probably here to kill me. I'll take care of him Chloe. Stay here."

Sam entered the barn with the Colt hidden in his jean's pocket ready for whatever this creature was.

"Are you looking for me?" A voice behind Sam called. He turned to see Clark standing at the opposite end of the barn. "I don't want to fight. I just want to talk."

"I'm not falling for that old trick," Sam thought and reached into his pocket to pull out the Colt. Before he could put his hands on it Clark sped to him and through him across the barn. Sam hit part of the structure holding up the top part of the balcony causing it to fall on him. Shocked at what he had done Clark ran to Sam's side and lifted the fallen debris of him.

"Are you ok?" Clark asked as he outstretched his arm to help Sam up. But suddenly Sam grabbed Clark's arm and threw him. Clark crashed throw several tables and felt the sensation of pain throughout his body. Both he and Sam rose to their feet at the same time ready for battle. Clark was shocked by what he saw on Sam's face. His eyes had turned completely white.

A/N: Sam has not been possessed or replace by any type of supernatural creature. It's really him.