A portal opened near a pit of sorts before TME floated over it before the portal closed, TME looked around before noticing he was on top of a mountain.
He then looked to the readers before clearing his throat before speaking to the readers.
"Hello readers, as you can read, this is a cross over of adventure time and undertale, I honestly have no idea idea if anyone else did this or I might be a first, just in case though, Disclaimer for all but OC's, then again there are no OC's in this story." TME said before shrugging before looking to the horizon.
"Now then, before we get into the meat of the story, let's start by going to the candy kingdom." TME said before the camera shot away from the mountain before showing the Candy kingdom gates while Finn the human walked towards the gate.
Candy Kingdom/ Main gate/ Finn
Finn the Human, who was 17 at the time, was walking towards the candy kingdom when he got a summons from princess bubblegum.
His wardrobe changes somewhat from the bearskin cap to a bearskin scarf while he wore baggy jeans that had rips on the end, finally he wore dark blue gloves with a hole on the right gloves palm, so dark that they looked nearly black in color, aside from that, his wardrobe was the same.
After Jake left the treehouse to live with lady, Finn trained with his various swords to get a good feel for them when he trained with rattleballs, he still couldn't get the shadowless thrust yet, but his overall combat skills where stronger then ever.
Unfortunately his Finn sword was still trying to recover after the bandit princess fiasco, but in the meantime, if certain conditions were met, Finn was able to use the grass sword, until those condition's were met though, he carried a few spare magical swords with him on his hips and a regular sword on his back.
Right now he had the sword of the dead and the pink jewel sword strapped to his back, he remembered the sword of the dead when he was looking for a replacement for the Finn sword and saw a green gem in his treasure pile, he went back to the area he remembered fighting Marceline's dad and found it, the pink jewel sword was in one of his weapon cabinets, the magic swords on his hips were the lighting sword from the dungeon train and a new magic sword he found from one of the newer dungeons he visited, this one could transform into a small but durable shield which had a self repair enchantment which helped him a lot, he never left home without it.
After walking through the gate, he walked to the castles front entrance before entering.
Candy kingdom/ Lobby/ Finn
When he walked in, Finn noticed that peppermint butler was walking towards him before bowing to Finn.
"Greetings Finn, the princess is expecting you in her lab." Peppermint butler said before leading Finn to the lab before leaving.
Finn knocked a few times before he heard Princess bubblegum speaking through the door.
"Come in." PB said before Finn opened the door before walking in before closing the door.
"Hay PB, you called?" Finn asked before he saw princess bubblegum walk around a computer while typing a few things into the keyboard before turning to Finn before smiling.
"Hello Finn, I know this is abrupt, but I need you to look into something for me." PB said before Finn grinned.
"No problem PB, whats the issue?" Finn asked with a grin before PB turned back to the computer with a serious look on her face.
"Well Finn, I was looking into some ancient writings from before the mushroom wars and I believe that there is something strange about this mountain when I scan the area where this map points to, I sent some candy people to investigate with some banana guards but they never returned, not only am I worried that something happened to them, but that nothing came back, no data whatsoever." PB said with a serious look on her face while Finn grinned.
"No problem princess, just point me to where this mountain is and I'll look for your candy peeps." Finn said before pumping his right arm while PB smiled.
"Thank you Finn, and don't worry about traveling there on foot, I made you something to help you get around Ooo, think of it as a late birthday present, I would have gave it to you on your 16th birthday, but some technical issues occurred and I wasn't able to work on it till recently." PB said before she walked out of the room with a grinning Finn in tow before the duo went to one of PB's workshops.
Candy kingdom/ one of PB's workshops/ Finn, Princess Bubblegum
PB walked into one of her workshops after unlocking a surprisingly sturdy door while Finn followed before he looked around the room.
He saw that it looked more like a garage then the other workshops, parts littered the ground near some tables, grease stains...stained the ground and tables, but the thing that got his attention was a large, cloth covered, object that PB stopped next to before turning to Finn while grabbing the cloth that covered the object.
"Get ready Finn, for your new mode of transportation!" PB said before pulling off the covers to reveal a surprising sight to Finn.
"Algebraic!" Finn muttered which made PB giggle a bit before turning to the vehicle in question.
The camera turned to show the vehicle in question, it looked like it was a motorcycle with large changes here and there, one was that instead of two handles for controlling the vehicle, there was three plus a red switch, two looked like they controlled the bikes direction, but the other one in the middle looked odd to Finn.
Another was instead of wheels, there was four disk like objects where the wheels should be while four stands seemed to come from the bike itself.
Another was a disk like object on the back of the seat.
Another was two box like chubby's attached to the sides of the seat, one was a simple box with a lid, while the other looked like a really small fridge with wires leading to the engine without hampering the riders legs.
There was a computer monitor with one of PB's hologem's attached to the top above the handle bars with wires leading to the engine.
Finally there was an odd glass like object on the front of the bike, it didn't look like armor or even protection at all, it had wires leading to the engine, there was a small disk similar to the one on the back of the bike.
"Now Finn, I'd like to say that this the first tested hover bike I developed after studying multiple pre-mushroom war technology, I'll explain each part real quick before you leave." PB said while Finn grinned again at PB's gift before PB walked over to the front wheels.
"First off I'd like to point out the wheels, their not wheels, their magnetic disks that create a magnetic field that work to repel from Ooo's magnetic field, when it comes in to land, it automatically extends the stands you see so the disks won't be damaged." PB said before he walked over to the back of the bike.
"The disk on the back creates a magnetic force for forward motion while the one on the front is for slowing down to break." PB said before walking to the chubby's on the sides.
"These are for storing things you find and for storing food that needs to be kept cold, simple as that." PB explained before walking to the front of the bike again.
"This Finn is called a solar panel if I read correctly at what this device is called, it gathers energy from the sun to power the vehicle and to charge the battery for nighttime rides, I managed to make it nearly indestructible but it is still able to break, also be careful on cloudy days, this thing is probably the most important piece to the magnetic bike, without it the engine wouldn't work at all, ergo no power to use it." PB said before going over to sit on the seat of the bike.
"Now then, you see here that there are four levers right?, these two control the direction and how fast the bike goes when you turn the right hand like so." PB said before twisting the motorcycle handle.
"The one in the middle controls how much power goes into the disks for altitude, or how high and low the bike can go in simple terms." PB said before pointing to the red button.
"This button is for emergency stops, it automatically makes the bike come to a quick stop before automatically making the bike lower to the ground safely." PB said before she used her right foot to touch a pedal that Finn missed seeing.
"This is for starting the machine, it needs a few presses before the engine fully starts, now for the one on the other side." PB said before Finn walked over to the other side.
"This is another braking device, however it only slows you down depending on how hard you press it, press it gently for a slow stop while pressing it hard causes it to stop harshly, twisting the handle the other way will have the same effect, now for the monitor." PB said before Finn looked to the monitor.
"This Finn is the brains of the vehicle, it already has all the known locations of Ooo already in it's databanks, just select a destination and the bike will automatically take you there on the fastest route, you can control it manually or just set it to autopilot by using the screens touchscreen feature I managed to engineer from old phones I found, there are other features but I'll explain more when you get back." PB said before getting up from the magnetic bike before turning to Finn.
"Alright Finn, just select the name I will write on this paper after I open the main hanger door, the bike will take you there." PB said before she walked over to her computer before typing on the keyboard, shortly after the roof of the building opened to show that he was under the main candy kingdom fountain.
Finn looked to PB who walked over with a slip of paper in hand and a pair of goggles.
"Here Finn." PB said before Finn took the paper and goggles before he read it aloud.
"Mt. Ebbot?" Finn said before looking to PB who nodded.
"Correct, most of the stuff I got was...iffy at best, but the name of the place was clear as day." PB said before he looked to the monitor.
"I installed a hologem so we could communicate if needed, and the goggles are for protecting your eyes, now I believe I've taken enough of your time Finn, please head to Mt. Ebbot and see what you can find out." PB said before Finn grinned while he equipped the goggles before sliding them over his eyes. (Think of Naruto's goggles before he got his ninja headband but in a dark blue color.)
"No problem PB, just need to stop the treehouse for cyclops tears and I'll be on my way." Finn said before he pressed the right pedal a few time which made the magnetic bike jolt while PB stepped back before the engine roared to life.
"Good luck Finn." PB said while waving a neckerchief before Finn saw a map appear on the monitor, it was a globe of Ooo before focusing on the area around the candy kingdom.
Finn saw the treehouse on the map before pressing on the screen lightly before a menu popped up.
"Travel to Finn's treehouse." The menu read before a yes and no button popped up.
Finn pressed the yes button before he got a little surprised when a seat belt appeared before wrapping around the front of his waist which secured him before the disks glowed before Finn rose in the air at a somewhat slow pace, it took 15 seconds to rise above the fountain while another 10 to get high enough to see over the candy wall.
The gumball guardians saw Finn on the bike before one of them waved to him with a neutral expression on it's face while Finn waved back.
"Please grip handlebars for safety." A mechanical voice called from the monitor screens speaker which made Finn reach for the handlebar handles.
After gripping the handles, the robotic voice spoke up again.
"Moving to Finn's treehouse in 3...2...1..." The mechanical voice spoke before the bike shot forward while Finn felt his body lurch back into the seat while he saw the scenery fly by before realizing that he was nearing the treehouse already.
Finn would have said something to express what he felt now but he couldn't really speak at the moment.
The Bike slowed to a halt before lowering to the ground while facing the sun.
Finn got off before entering his house after realizing that he zipped from the candy kingdom to his house within a minute or two, while it took him 15 on foot.
Finn's treehouse/?/ Finn
Finn replaced the sword of the dead for the steel sword from the fight kings arena after it vanished, is seems the sword fell from the vanishing stadium.
The sword of the dead wasn't bad but it was bulky, he did however decide to take the sword of the dead with him in the chubby when he found out that the sword blade could detach from the handle.
Finn then went to his stash of cyclops tears while the cyclops slept in a large wardrobe before taking 5 bottles with him, better safe then sorry after all.
Finn exited the house before walking over to the magnetic bike before hopping back on
"Now then, PB said the place is in this auto map thing." Finn said before he noticed a place far off mountain north of the candy kingdom, he pressed the mointain icon before grinning at what he read.
"Mt. Ebbot." Finn before he pressed the yes icon after putting his things in the cubby which closed with a click before the seat belt appeared again.
Finn was ready this time when the bike rose in the air, he gripped the handles before the bike stopped after rising a bit above the candy kingdom's gumball guardians full height which made Finn gulp a bit before the bike shot forward while the bikes robotic voice spoke up.
"Arrival to ... 8 minutes." The robotic voice said which made Finn who's goggled eyes widened in surprise, Mt. Ebbot was that close?, if so then why didn't PB find out about this place earlier?
Finn then chalked it up to the fact that PB was missing some data like she said earlier before he relaxed to enjoy the ride while the scene shifted to later.
Mt. Ebbot/ Mountain base/ Finn
Finn arrived at the base of before the bike lowered to land, after it did he grabbed his cyclops tears before placing them in his backpack before grabbing the pieces of the sword of the dead before putting them back together.
Finn then faced Mt. Ebbot before looking around while he held the sword of the dead at the ready.
The Candy Citizens where nowhere in sight.
Finn then looked to the top of the mountain before deciding to climb to the top to see if anyone was there in need of help.
Mt. Ebbot/ Mountain top/ Finn
Finn's trek to the top was surprisingly uneventful, he at least expected a few monsters or something to block his way but the place...seemed empty of life.
And that's what unnerved Finn greatly when he reached the top, he saw nothing again before he looked around.
"Where are those guys?" Finn muttered while he rubbed the back of his neck before looking around again, however something shiny near the edge of the hole got his attention.
"What the?" Finn said before he walked over to pick the object up.
However when he reached the edge, the group shook for a moment which surprised Finn before things got calm again which made him sigh in relief, he wasn't afraid but this place was creeping him out.
When he turned to walk back, the ground under him broke which was the last thing Finn remembered before the scene faded to black.
TME walked from behind a tree after he saw Finn fall into the hole before he looked to the readers with a grin on his face.
"Well readers, Finn is now heading to the underground, what will happen next?, Will Finn's adventure through the underground be pleasant, or will he have a bad time?" TME said with his left eye emitting a glowing green mist while a wide grin appeared on his face before a dimensional gate opened behind him.
"See you all next time on Adventuretale!" TME said before stepping through the gate before it closed with a bang before the scene faded to black.