Fandoms: Undertale and Marvel

Ship: None

Timeline: During Infinity War 1

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Side note: The reason I've been all over Marvel recently is that I got back into it after watching Infinity War. So, Sorry. Also, please watch the video above it will make much more sense. (At least for the second part, where I will put the second part of 'The Truth behind Chara')

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Sans's POV:

I emerged from the mountains, Asriel wrapped around my shoulder. My tears glittering in the sunlight, I looked back at the dark passage that led to our old home. Our last home. We had just barely defeated that damned human, but it had been too late for every other monster in the Underground.

"Sans. Look." Flowey whispered. I looked back to the surface and saw a rather large ring of some sorts floating in the sky. I saw it was taking off, though I could barely make out a tiny figure somehow jumping onto the ring. I prepared my magic to teleport, adressing Flowey. "We need to see what's happening." I murmured. Flowey nodded. "Then let's go, shall we?" He asked.

I smirked, snapping my fingers. Now, we were surronded by futuristic technology and designs. We were on a balcony that went all the way around the circular room. The middle went down to the regular floor. There, someone was being torchered.

I shared a glance with my honorary brother. He saw what I was thinking and nodded. I teleported down as someone from a lower level was coming towards the same place. I jumped slightly.

"What the heck!?" Flowey shouted in suprise. Two people in iron suits, one shorter then the other, landed in front of me. "Who-" I began, but Flowey was grabbing the guy who was torchering the first guy, who had salt-and-pepper hair. Azzy wrapped his vines around the alien. I snapped out of my shock and selected my magic on the spikes.

I used all my magic to pull them away, but they would barely move. The shorter guy took notice of this and shot some kind of webbing from his suit, it grabbing onto the spikes to help pull them back further from the guy. The other guy turned to me, beginning to question me. While he was talking, the spikes gave way.

I stopped my magic, and they all fell to the ground, including the guy, who groaned in pain. I looked at the short guy, who was just the same height as me. "Thanks." I said, taking off my hood to reveal my skeletal features. The short guy suddenly burst into questions.

"Woah! You're a skeleton! That's so cool! How did you do that thing with the blue aura? That was awesome!" He rambled. I blinked, then chuckled sadly. This kid acted a lot like Papyrus. "Heh. A young one, I see. How old are you? Fifteen? Sixteen, prehaps?" I asked. He gasped. "I'm Fifteen! But, how did you know?" He asked in shock.

I chuckled. "Your voice isn't exactly the most mature." I stated. The guy with salt-and-pepper hair stood up, brushing off his clothes. He turned to adress me. "Who are you? Why are you here?" He asked cautiously. I stayed relaxed.

"I'm Sans. Sans the Skeleton, as you could probably tell. As for why I'm here? I saw the giant ring in the sky and wanted to know what was going on. So. What is going on?" I asked, but paused. I noticed his strange necklace. Suddenly, I had a very, very faint memory when I was, maybe six on the surface.

I had opened a random book, bored, only to flip through the pages and see a drawing of an amulet just like the one around his neck. It was an artifact. The book had called it an 'infinity stone', but what was it called again?

I remembered. "And why do you wear the Eye of Agamotto?" I finished. The man blinked. "How did you know it's name?" He asked fiercely. I shrugged. "Saw it in a book once. Long ago. All I remember is the name and that the author called it an 'infinity stone', though I have no idea what that is." I explained.

Suddenly, Flowey called us over. "Sans! I've captured him, but I can't hold him forever! Every vine I summon is actually part of me! I can't leave without him being free." He explained. I thought for a second. "Let him go." I said. Flowey quickly unwrapped himself. I used my magic and grabbed the alien's soul, throwing him into a wall.

I summoned blue bones through him and let go. Everyone looked suprised to see that he wasn't dead. "Blue means 'stop'. If you move, even slightly, you will be impaled. Imagine a stop sign. You stop, right? But this time it's blue. If you feel like moving, think about blue stop signs." I told him.

I then walked over to Asriel and reached my arm down. He wrapped his stem around it, and I stood up straight. I walked back to the group of people I didn't know. "How did you do that?" The guy with salt-and-pepper hair asked in shock. I shrugged. "Magic. But anyway, you're not the only ones with questions. Who are you? What is going on? Don't tell me you don't know because I don't think a couple humans like you would stow away on this, this, ship without any good reason." I stated.

They considered that, and the two guys in suits took of their helments, revealing a young face and an older face. "Alright. We'll tell you, but who are you two? Tell us your story first." The old one argued. So we did, Asriel adding in how he died and why. He explained about Chara and her death.

When he said that, my eyes turned black. I looked at him. "What?" I said, too in shock to say much else. After that tangent, we explained about the Resets and the Genocide Runs. They all did a double take on that one. "And that's it." I finished. However, I didn't mention the fact that I had killed four human children.

The old guy blinked. "Woah. After that, even I think you should know what's going on." He said, glancing at Papyrus's scarf wrapped around my neck. He was interuppted by the alien. "Heh. Even with beings so powerful on your side, you cannot win. Soon, Lord Thanos will have all the stones, and nothing can defeat that." He said.

I shrugged. "Well, actually, you won't live long enough to tell him, whoever Thanos is. With their salt-and-pepper hair, you're bound to sneeze." I said. They all blinked. The alien didn't say anymore. "Now. What about your story? What's going on?" I asked, turning to the others. They told their names and explained everything. Afterwards, I blinked. "Woah. Honestly, I'm not sure which of us has seen more." I admitted.

(Time Skip to the Battle with Thanos)

3rd Person:

Everyone on the Battlefield had wounds. Well, except Sans. Sans was too fast to hit. But, along with the rest of them, Sans was getting tired. He hadn't explained about HP or why his was so low, but he would've had to explain at some point.

But soon in the battle, everyone except Sans fell. Strange, Tony, and Starlord had gashes in their foreheads, and Strange's magic cloak was ripped. Peter Parker had a broken arm and his ankle was twisted in an awful angle. Most heros were barely conscious.

Sans was breathing heavily, tired from dodging. Thanos was on the opposite side of the sandy clearing. Sans stopped and spoke. "You sacrificed the one person you loved for what you wanted. But what drives you? Why do you wish to destroy half of every life?" He asked.

Thanos kept his gaze. "My planet was over-populated. I suggested to kill half our kind. It would have saved them. But they refused my idea, and they betrayed me. They couldn't find a solution, and my planet became barren, without life. I made it my life's work to destroy half of everything so other planets won't suffer the same fate." He said.

Sans thought about that. "How far will you go to get what you want? Will you do so, even if it means killing those who are innocent? Pregnant mothers, children who have barely began their lives, those who wish for nothing more then what they need? If you gather all the stones and put them in your gauntlet, snapping to erase half of everything, well, there is no fine line straight down the middle. You could turn anyone to dust, no matter their age. Heck, you could turn yourself to dust. So why try?" He asked carefully.

Thanos blinked, but then braced himself. "No. You are wrong. I am helping future generations." He growled, throwing an attack at Sans. It hit him, plunging through his chest, taking down his HP to 0.0. He collasped on his side. Thanos had won.

Peter Parker had heard the conversation. Everyone in the clearing did. Peter opened his eyes and saw Sans collasped, beginning to turn to dust. He tried to move, but his arm and ankle screamed in protest.

As Sans was turning to dust, his thoughts went to his family. Not just Papyrus, but everyone: Toriel, Asgore, Undyne, Alphys, Grillby. All those who had died. What would they say? They would want him to stand and stop Thanos. They would all be cheering for him, edging him on. They would catch him if he fell. They would pull him to his feet. They would want him to save half the universe.

A voice spoke in all the hero's heads. A memory. But who's?

"You're going to be alright! Stay determined!"

They felt a new feeling, one that burned passionately. One that reminded them of everyone who were counting on them. The Innocent, The Broken, and those who could not fight for themselves. One that pushed them to stand back up and fight for what was right. This feeling...

They knew what it was, and it healed them. It was....

*DETERMINATION