This is a connection story between Adventure Time and Regular Show. This story portrays both shows as if they are in the same universe and will try to offer origin stories to many Adventure Time items and the end of the Regular Show story, such as the Enchiridion, the Mushroom War, Marceline, the Candy Kingdom, and the Lich.

In regards to Adventure Time, everything passing and including "Blades of Grass" will not be included, except for the Stakes miniseries. Nothing after "Steak Me Amadeus" will be considered in regards to Regular Show. I apologize, but this story was started before those events and is now too large to change so drastically.

::Rated T for this one, but later stories will be rated M::

Enjoy!

Disclaimer: I do not own Regular Show or Adventure Time, all rights are reserved by Cartoon Network. None of these characters or these items are owned by me.

Prologue

"WOO! Now that's what I'm talking 'bout!" Finn exclaimed with childlike glee. "I haven't gone adventuring in weeks! Nothing clears your head of lady-bis like raiding dungeons, huh Jake?"

"Ughhh, yeah. Sure man..." Jake said with an unenthusiastic tone as he trudged behind his adoptive brother. Jake was just about beat. The two had shared five straight days of clambering through caverns, old ruins, and dungeons. He simply refused to understand how Finn had the energy to keep doing this junk. He figured there was something wrong with the blond haired boy, and this was the only way he could mask it. "I think I'll just go home and take a quick power nap..." he said with a yawn.

"Aww, what? But there's still so much-... Jake, do you see that?" Finn said as he stopped in his tracks, staring intently at the object.

"Why, what is it?" Jake asked but soon froze as well.

Before them sat a bomb, laying in the stump of a tree left over from the Mushroom War. Somehow, it hardly showed any sort of rust or decay. Whatever symbol was on the side made no sense to Finn whatsoever. Usually the bombs he did find were corroded and completely unrecognizable. But this one looked pristine, fresh off the ugh-... whatever this was shot from.

Finn walked towards it, almost enchanted with curiosity. Jake had notseen any in this good of quality either, which worried him. Jake extended his arm outward and halted his brother, "Hey! Come on Finn, don't get a case of the stupids."

"Relax man, I just want to get a better look at it. It'll be fine," Finn said reassuringly. Even from a distance, it was intriguing, every inch of it. The unfamiliarity of it all... the nature, it was simply... human. There was no other word for it. These old relics harkened back to a different time; a time drenched in mystery.

"It's a bomb. A BooOoaammmbbppp! Bombs explode. Come on, let's just head home, I think we're both a little tired anyway. I'll make us some of your favorite meatloaf," Jake reassured. What had gotten into that boy? First the whole Flame Princess ordeal, then the sword shenanigans, and now this,whatever this is.

Finn frowned in defeat as he reluctantly followed his friend.

Jake glanced to the sulking teen as they walked side by side. The sun was setting off in the distance to their right. The light emulated off of the boy. His shadow cast over Jake as he saw a faint silhouette of Finn. "Hey, bro. What's been up lately? You seem kinda down in the dumps," Jake followed, more concerned.

"Nothing much."

"Aww come on, Finn. Don't be lyin'. I can tell when you're lyin'!"

Finn sighed, "I'm sorry, I just wanted to know more about where my peeps are from. I mean I am the only human and all..."

Where did this come from? It had seemed like ages since Finn cared about those lousy humans. But why all of a sudden? Why now? Jake pondered this as he said, "Look, Finn, I know they're your peeps, but we're your peeps now. We're your family, dude."

"Yeah, okay..."

"But if you do get curious, just don't got chasing after bombs next time like a dufus. Okay?"

Finn replied in a lighter tone, "Hey!"

After a few minutes of walking, Finn finally asked the burning question, "Hey Jake... How did the Mushroom War start anyway?"

The bulldog simply shrugged as they continued on their walking.

This still left Finn pondering, "How did it start...?"

997 years earlier...

Running.

Endless running.

A day's worth of exhaustion and regret left him tired. Hopelessly, he continued his unending sprint into nowhere. Though the dense underbrush of the forest clouded his view, he felt them getting closer. He felt them all around him. His instincts never failed him before. Bang. Angry bullets rang out from behind and whizzed overhead like furious wasps. The rattle of the machine guns deafened all noise. Abandoned by his friends, by the people he loved, Rigby was completely and utterly alone; slowly being enclosed from all sides. Though for a short instance, he felt grateful for the forest of all places; the trees provided him cover every step of the way. The book urged him on, telling him exactly what Rigby needed to do. At this point, Rigby already knew what would come if he dared bend his will again...not like last time...

There was no option for him but to run, and just continue running. At once, his path was cut off by three of them. They leaped out in front of his path, MP5's at the ready. Rigby slid to a halt and he leaped to his right. The bullets pierced the ground where he previously stood as the terrified raccoon took off sprinting on all fours.

"Crap!" Rigby screamed. His path opened into a clearing with a cliff standing no more than fifty feet from the treeline. The drop was too high to jump down. By the time he had turned around, he was already surrounded. There was at least fifteen sentries, with more most likely following behind. "You know what you need to do" whispered the book into his head. "Why should you show them mercy? Let me in." NO! Not again! He promised himself he would never succumb to HIM again.

They raised their muzzles to him, fingers on the trigger, their face masks shrouding their faces in a blank stare of death. He didn't have much time left. Rigby was in a panic. There was no way out. "Stand down and put your hands behind your head!" the voices yelled directed at Rigby. The hopeless raccoon knew he could not surrender, not like this. His handgun still sat holstered across his chest. He did not need to count to know that there were still at least four or five rounds left. That could count for little here, however. "LAST WARNING, STAND DOWN!" Rigby remained unyielding. Beads of sweat trained on his forehead as he waited for the inevitable.

He was holding back.

"OPEN FIRE!" Rifles cracked through the air. At last, Rigby was forced to lay a card on the table and make a move. In the split milliseconds, the green light encompassed his hands. He threw his arms to the ground in front of him. The glowing shield wall burst to life in front of him. His recently found power kept him alive. The rounds zipped and ricocheted off the green, glowing wall of dense, demonic fire. But this couldn't last for long. It was weakening, gradually fading with each shot. The already exhausted raccoon struggled to keep it formed.

"Aren't you tired?" The voice was soothing. "Aren't you tired, Rigby? ...Let me in Rigby." At this point He was right: there was no real choice. Rigby let go... and The Lich took control...

Two months earlier

"Dude, I'm totally going to go through with it tonight!" Mordecai said excitedly to Rigby...