Disclaimer: I don't own Adventure Time, and I make no profit from this.

Please read the Author Notes at the end of the chapter.

Prologue-

It was almost like any other day on the Grass lands in the land of Ooo, or more precisely inside the Mertens house. Home of the great hero Pen and his loyal companion Bartram the mule.

But what made this day different from any other day? Well, today it was an extremely hot day.

"Man! It's so hot today!"- said the young human hero to his mule friend. Pen was sitting on the couch inside the living room, with Bartram sitting next to him.

It has been a long morning of chores and farm work fir the both of them. Pen couldn't complain, because the farm was the primary income for the family (aside for the occasional treasure that Pen and Bartram found in their adventures). And after finishing all his chores both him and Bartram were very tired from working under the blazing sun.

Bartram the mule nodded his head in agreement with his friend. He too felt that the house was too hot for comfort.

"I wish there was something to refresh ourselves with!" - Pen kept complaining while fanning himself with an old fan from his mother. He had already checked on the fridge and there were no cold drinks for them to enjoy.

Both heroes sat there for a while, not knowing what to do. That is until Bartram stood up, walked towards the open window and stuck out his head as if trying to point at something.

"What is it Bar Bar?"- Pen walked next to Bartram trying to see what his friend was pointing at. –"The Ice Kingdom? Yes, that's a great idea! You're a genius Bar Bar!" -The boy went rapidly to his room to collect his adventure backpack and famous yellow hat that covers his light brown hair.

"I better pack a sweater, mom will kill me if I catch a cold"- The young boy still remembered the last time it was cold and didn't took a sweater alongside him. He ended up sick and his mother grounded him, but only when he began feeling better.

Then Pen remembered that his mom hadn't arrived yet from her visit to the Candy Kingdom, which was located very near from where the farm was.

"I should leave a note, I don't want mom to worry." That was also another lesson he learned the hard way. After he wrote the note, he left it on the fridge and went outside, ready for an exciting day!

Pen jumped on Bartram and the two of them rode to the Ice Kingdom.

After Pen and Bartram were halfway to their destination, Mrs. Mertens arrived from her shopping trip from the Candy Kingdom. Sure it was strange how the world had changed so radically from what she and her husband were accustomed to.

From normal humans to candy people, talking animals and other kind of strange and mystical creatures, but she saw it happen with her own eyes, the day that foul essence covered the world and when that meteorite struck the earth causing mutations at an accelerated rate.

The world would have been in complete chaos if it weren't for the appearance of leaders that created the kingdoms that now covered the new land of Ooo.

As for humanity, her husband and she established a home and a little farm on the Grass lands and sent out a message around Ooo in search of other human survivors. That was 12 years ago and they never found any.

Sure, there were humanoids with strange color skins and other characteristics, but as far as the Mertens family knew they were the only "normal" humans left.

But in the end life in the land of Ooo although strange was better than living with fear under the tyranny of the Destiny Gang.

"Pen! Honey, I´m home!"- Mrs. Mertens said while carrying all the supplies she bought in the Candy Kingdom. Mrs. Mertens really liked her visits to the Candy Kingdom. The citizens were always friendly with her and her family and travelling between the house and the kingdom was short and more importantly safe.

"Where is that boy? He better not be out there having adventures before finishing his chores"- It would seem strange for a mother to let her son have adventures in the strange and dangerous land of Ooo. But Mr. and Mrs. Mertens had noticed that their son was incredible strong and agile for a boy his age. Her husband had theorized that it was a possible side effect from the mutations that created Ooo, and if that was the case the Mertens still loved their son Pen all the same.

Also not only Pen was strong, he was brave and righteous, he could never stand doing nothing when people needed help. A trait which she had no idea how or where he got it from, but nevertheless she was proud of her son.

Thanks to their son, her husband and she had met a lot of good people that became family friends; like Tree Trunks, that sweet elephant who bakes delicious apple pies; And even royalty, like Bubblegum Princess ruler of the Candy Kingdom, whom Pen has helped and saved a few times.

Being a Hero was a big part of Pen's life so she couldn't deny him the need for adventure and heroism but that didn't mean she wasn't worried every time Pen went out with Bartram adventuring or that he could do go out without finishing his chores first.

"Where did that boy go this time?"- Mrs. Mertens wondered out-loud before noticing a note on the fridge. Pen would usually wait for her or his father's permission before going out on any adventure, but if there was an emergency and they weren't present Pen would usually write them a note explaining where he was.

" Mom,

Bartram and I went to the Ice kingdom to play.

P.S. I already finished my chores.

P.S S Yes, I have a sweeter.

Love, Pen."

After reading the letter Mrs. Mertens gasped in fear. Of all the places he could go, he had to go there. Quickly she ran outside the house with worry on her face. -"PEN! PEN!"- She called out for him but she was too late they were already far long gone.

Mrs. Mertens put her hands together intertwining her fingers and prayed to the sky. –"Please God, I beg you, please don't let Pen meet ´him'! Please, let him out of the Ice Prince's sight. Don't let him meet his brother".

Author Notes:

This Fic was inspired by rumay-chian from deviantart.

Although it is loosely based on the comic, I highly recommend checking her comic "The Ice Prince" and her Deviantart Gallery.

Note: The comic is in Spanish but it has the English translation at the bottom.