A/N- So, I just got Overwatch (probably should have gotten it sooner) and instantly came up with the idea for this xover. Reaper and Mercy are practically polar opposites, so I thought that forcing them to interact with one another would be interesting. Bastion and Orisa are along for the ride as I wanted one of each class type in order to make a team. The reason I choose those two in particular is something I will go into at a later date.

I will do my best to keep everyone in character, but I may take some liberties here and there. Reaper in particular will have OOC instances, but not without good reason. Despite how much he seems like a straightforward psycho killer, there is much more to him than that. For those of you who are unaware of his past, he used to be Overwatch's commander. That also means that Mercy was under his command at some point. I try to pick up various nuances and subtle details about him and make my own theories about him using what little we know about him and his motives.

Also, I am not 100% sure whether or not it is public knowledge that Reaper is Gabriel Reyes to the rest of the Overwatch members (i.e. Mercy). As such, Mercy will be unaware that he was her former commander. This also means that Reaper will be referred to only as Reaper whereas Mercy will also be referred to by her actual name.

I hope you like this, and be sure to leave a review.

Disclaimer- I OWN NOTHING!

(-)

Her head was pounding like a drum. Almost as if an entire marching band was going through a routine in her brain. The copper taste in her mouth gave her an indication that she had at the very least busted her lip, and ruptured an internal organ at worst. She preferred it be the first. Feeling the warm liquid dribble out of her mouth, she commanded her body to raise her arm to her lips in response. A sense of numbed exhaustion was all that she got in return. Her muscles ached something fierce, as if she had just finished a marathon. There was a good chance that there were a few torn tendons. A cool breeze blew across her face, ruffling her hair in the process. Ignoring the burning sensation she felt, she forced her eyes open in order to better determine her current condition. Her lids flickered open, only to be met with darkness. Not darkness from being rendered blind, but rather a simple lack of ambient light. She could make out the faint outlines of her surroundings, but that was it.

After what felt like an eternity, the nanites inside her body finally began to make progress on repairing the damage done to it. Reaching her hand up, she wiped the blood from her mouth before groping through the darkness around her position to find her staff. She could only hope that her most precious tool was still within arms reach, as the last thing she remembered was holding on to it for dear life. Eventually her hand found purchase. The Caduceus Staff was a healing implement of her own design. There was no way in hell she was going to mistake the feeling of its grip for anything else. Sliding her hand down the staff, she managed to press a button which activated the healing beam. Though it did her no help that the beam was pointed away from her, the light produced from it was her actual goal. Though it wasn't overly bright, the beam was still enough to light up her surroundings.

She was in a forest of some sort. That much was obvious given the texture of the grass beneath her and the tree that she was leaning against. However the fact that she was in a forest at all was confusing. Last she remembered, she was at Watchpoint: Gibraltar. But that was before the... explosion? For whatever reason, be it head trauma or something else, she had trouble recalling her last memories before losing consciousness.

A deep groan caught her attention as she shifted the light from her staff to the tree across from her. One would almost miss him if they weren't looking carefully, given how his clothes blended in with the darkness so well.

A rare scowl worked its way across her face. "Reaper." she spoke the name with disdain. Despite how much she abhorred death and violence, even she would hesitate to heal the man, no, the monster in front of her.

"Heh... Nice to see you alive as well Angela..." the Death impersonator's voice was rough. Rougher than usual. And given the numerous blood stains seeping through his clothes, it was hardly a challenge to figure out the reason.

"Don't get smart with me." Angela responded as she reached for the holster at her hip, only to be surprised when she found it empty.

"Looking... for this?" Reaper asked as he held up one of his hands to reveal her only weapon, the Caduceus Blaster.

"You- how?" she asked. Though it sounded more like a demand.

"Oh? How... rare it is... to see you... angry..." Reaper responded weakly. Though despite this, one could still tell that the man was grinning behind his mask.

Angela wan't in the mood for games. Her glare was making her intent towards Reaper clear enough that even a child could discern it.

"Don't act like... you would have been able... to pull the trigger..." he rasped out as he twirled around his finger. "We both know... how much of a... pacifist you are..."

"So what is this?" Angela spat as she slowly lifted herself up to get a better view of Reaper. "You're going to threaten me with my own gun and force me to heal you? Just what I'd expect from someone like you."

"You... wound me..." Reaper joked with a weak chuckle. "Besides... we both know... that you will heal me... regardless of if I threaten you or not... You can't stand to watch people die... even if it's a killer like me..."

"And I know that you'll kill me as soon as I do that." responded Angela.

The two sat in silence for a few moments, staring each other down, trying to determine who would be the first to give in. Surprisingly it was Reaper.

The killer huffed in resignation before tossing the gun back to its rightful owner. Angela's eyes widened in confusion at Reaper's act. Sure, he had his own guns, but Angela was unarmed. Now she had the ability to shoot back. "Why?" she asked.

"As much... as I would like to... kill you... our current predicament... will most likely require... all of us to... work together..." he answered as he used his head to gesture to the side.

Angela shifted her staff once more and noticed that they weren't alone. Though they were omnics, they were still counted as allies amongst Overwatch's forces. Bastion and Orisa. Both were currently offline and heavily damaged.

"Seeing in the dark... has its perks..." spoke Reaper.

"What do you mean 'our current predicament will require us all to work together'?" Angela asked as she used her staff to begin the process of repairing the omnics.

"You'll see... the next time the clouds clear..." answered Reaper. "As for why... I gave you back the gun... I'm just hoping... that you'll find it in your heart... to trust my act of kindness... Can't believe I just said that..."

"I can't either." responded Angela. As she was restoring Bastion, a howl in the distance caught her attention and caused her to temporarily halt her actions.

"I suggest... you hurry up..." spoke Reaper as he reached into his cloak and pulled out a pair of shotguns from his seemingly endless supply.

"What was that?" Angela asked as she resumed the healing process.

"Something to kill... Ignore it and keep working... I'll hold them off..." Reaper answered as he adjusted his position to face the direction of the noise. "Again..."

"Again?" Angela repeated in confusion. Finally her eyes adjusted enough to the darkness to notice the spent shotgun shells and empty shotguns that littered the forest floor around Reaper.

"Still can't believe... that you slept through... the first attack... You're welcome by the way..."

Angela was surprised to learn that even in his wounded state, Reaper did his best to protect her and the omnics. She was well aware of the disdain he held for the robots, as well as how much he despised her. Quite frankly the two of them were complete opposites. He lived to kill. A monster who slaughtered indiscriminately for whatever reason he fancied at the time. Whereas she lived to save. A guardian angel who frowned upon violence. Whatever was going on was serious enough to make Reaper of all people ensure her survival. And that did not bode well.

Thanks to her self-healing, Angela was for the most part recovered now and was able to stand back up. Bastion was almost back online and would be able to help them in defending their position, but the sound of rustling in the nearby bushes informed them that their safety window had closed.

Lunging out of the darkness of the forest was a beast unlike anything Angela had ever seen before. Looking as if it was born from the depths of Hell itself, it had a vague resemblance to an over-sized bipedal wolf, but that was it. Fur that was darker than night itself coated the beasts body, bristling with unadulterated rage. Glowing red eyes that radiated malice bore into Angela's form. A mask that was seemingly made of bone covered the majority of its face. Razor sharp claws glinted in the light created by the Caduceus Staff. If Angela had to identify this beast, she would not hesitate to call it a Hell-hound.

That being said, the creature only got out a partial roar before its head was blown off courtesy of Reaper's Hellfire shotguns. "Play dead..." Reaper remarked as the body crumpled to the ground.

Undeterred by the initial scare, Angela finished up her work on Bastion. The omnic's diode lit up with a blue light as its systems reactivated.

[Dwee wee woh.]

"Bastion, can you hear me?" Angela asked as she waved her hand in front of Bastion's 'eye'.

The robot nodded in response. [Vee.]

The sound of more beasts bursting through the foliage followed by the loud bark of Reaper's guns was enough to startle the robot.

[Dweet, dweet, dweet!] it exclaimed as it jumped to its feet.

"We have no idea what's going on right now or where we are." explained Angela. "For now I need you to hold off these beasts with Reaper until I can finish restoring Orisa."

Bastion gave a quick salute before walking past Angela to take up a defensive position. It's diode turned red as it activated its combat programming and readied itself for battle. Re-configuring into Sentry mode, Bastion aimed its minigun down range and waited for the next beast to approach. It didn't take long.

The creatures began pouring out of the treeline like it was nobodies business. What first started out as a small pack eventually became a horde. A veritable wall of claws and fangs cascading towards them. They were met with unrelenting firepower. Bastion mowed down the beasts at range with ruthless efficiency. Its minigun perforated the creatures, reducing them to shredded remains that were hardly recognizable for what they once were. Any that managed to dodge past the robots volley of gunfire was met by a spray of pellets at close range courtesy of Reaper.

Nevertheless, the mindless horde continued in its assault. Despite dying in droves, the beasts refused to back down. It was almost as if they didn't care for their own well-being. What could possibly drive them to do such a thing? Questions like this would have to wait for the time being.

During the attack, one of the larger wolf-things that had spikes protruding from its back managed to flank around to the side and blindsided Reaper. The beast tackled the downed killer as it pinned him using its massive paws.

"Get off me!" shouted Reaper as he used his hands to hold back the beasts gaping maw which was snapping at his face.

Suddenly a massive frame slammed into the creatures side and smashed it up against a tree. The force used was enough to liquefy internal organs as well as shatter the trunk of the tree, sending it toppling over.

Sitting up, Reaper was greeted by the sight of his savior, Orisa.

[Are you alright?] she asked as she jostled her arm to shake the body of the dead creature off.

"Fine..." Reaper responded as he returned his gaze to the horde. "Now let's get back to work..." he said as he pulled out another pair of shotguns and aimed them down range.

(-)

Clawing its way forward was the last of the attacking beasts. Its hind legs had been severed from its body as a result of combined fire from Bastion and Orisa, yet its determination to kill seemed to prod it onwards. Whether or not it knew it, the beast was already dead. So either it pushed on knowing that it would inevitably die and wanted to do so fighting, or it was so dumb that it failed to realize what was happening to it.

Whatever the answer might be, it all pointed to one conclusion; the beasts purpose was to kill, and only death would stop it from doing so.

There was something about that which Reaper could respect. Still, it didn't change the fact that the beast was trying to kill him. So it was no surprise when Reaper pressed the barrel of his shotgun up against the beasts forehead and pulled the trigger. A staccato boom echoed through the forest, signaling the end of the conflict. Black ichor splattered all over Reaper's lower garments as well as on the shotgun itself. From what Reaper was able to observe, the creatures and their bodily fluids evaporate after a short while, so he wasn't worried about the mess. Tossing the spent shotgun aside, Reaper cast a quick glance around before nodding in satisfaction. "Clear."

Orisa gave a quick scan of their surroundings before nodding in agreement. [Affirmative. Preliminary scans no longer detect the enemies presence.]

"Yeah, like I said, clear. Damn rust bucket..." grumbled Reaper.

[I do not appreciate the tone you are taking with me. I was just confirming your claims.]

"Well get used to it." Reaper responded as he lazily waved off the omnic. "Frankly, you should be content with the fact that I haven't ripped your head off your body by now."

[You are testing my patience, as well as my trigger discipline, Reaper.] Orisa replied as she slowly raised her Fusion Driver.

For a few moments the assassin and the omnic had a silent standoff, each ready to spring to action at a moments notice.

[Beeple.]

Seemingly unaware of the tension in the air, Bastion jarred its chassis whilst making bird-like noises to draw out Ganymede. The small bird flew out from the omnics innards moments later before perching on its outstretched hand.

[Doo-woo!] the robot exclaimed in joy as it confirmed the status of its tenant.

Reaper let out an annoyed sigh before turning away from Orisa, the tension in the air having dissipated. He made his way over to one of the nearby trees where he leaned up against it with his back. Crossing his arms in front of his chest, he leveled his head so he could view all three of his 'allies'. "Now that we finally have a moment to breathe again, we can properly assess our situation."

"And what exactly would that situation be?" asked Angela. "You've made it clear that we are stuck in some sort of predicament, those beasts a testament to the fact. But just how bad is it that the ruthless Reaper would be required to work together with his enemies?"

Whether it was a coincidence or some form of cosmic intervention, the clouds chose this moment to disperse and allow the light of the moon to shine down. Reaper raised one hand and pointed at the sky. "Take a look for yourself."

The trio turned their gaze skyward to see what Reaper meant. And what they saw left them speechless.

"Last time I checked, the moon was still whole."

For hanging in the sky, was a moon much different from the one they remembered. Liked shattered glass, there were fragments of the moon floating in the empty space between them and the remainder of it.

"Dear God..." Angela gasped as she covered her mouth with her free hand.

[W-w-wooooo...?] Bastion tilted its head in confusion.

[Error 404; response not found.] Orisa spoke as she tried to process what she was seeing.

Giving the trio a few moments to compose themselves, Reaper simply took amusement in observing their reactions. "So," he spoke up, garnering their attention. "you can see the dilemma we are currently facing. Good. Now we just have to determine exactly how we came to be in this situation. Does anyone recall what was happening before blacking out?"

[My memory banks recall an attack at Watchpoint: Gibraltar. However the majority of the details seem to be missing, possibly due to damage. Performing diagnosis... Diagnosis complete. No damage detected.] Orisa shook her head in disappointment. [I am unable to access my immediate memories prior to going offline. The data seems to have been erased.]

[Zwee-ah wheee doo woo.] Bastion answered in confusion for what it was worth.

"I... recall an explosion at Watchpoint: Gibraltar... But that is it..." spoke Angela.

"Hmm... That coincides with what little I can recall as well." responded Reaper before he grumbled in aggravation. "Since we can't discern how this came to be, our next order of business should be to figure out what our situation is." Reaper held out his hand and held up two fingers. "As much as I don't like them, I have narrowed our predicament down to two possible scenarios. The first is that we have somehow been flung into the future and that somewhere along the way the moon was destroyed and someone bio-engineered those nasty beasts from earlier. Moira probably."

"Doesn't that sound a little far-fetched?" asked Angela.

"Like I said, I don't like these scenarios, but they're the best I could come up with. And besides, don't you have that annoying dyke who likes to play games with Time on your side? You're really questioning whether or not time travel is possible?"

"Watch your mouth Reaper. Otherwise I will sew it shut." scolded Angela.

"I'll take my chances." responded the killer. "As I was saying; the second scenario is that somehow a hole was torn in the space-time continuum and we were flung into another world."

"That's even more outrageous than your last theory!" shouted Angela.

"Keep testing my patience woman. It'll make killing you all the more tempting then it already is." Reaper growled in response.

Letting out a huff of resignation, Angela calmed down and started to think things through rationally. There had to be another explanation for what was going on. Virtual reality? No; the pain was too real. Perhaps they were evacuated after the explosion? Then why leave them in the middle of a forest. That still didn't explain the moon or the beasts. Wildlife that hasn't been discovered yet? No; the chances of such unique, numerous, and aggressive beasts having gone undiscovered for so long are too slim. And what of the moon? She didn't know of any technology that was capable of reducing the moon to the sorry state it was currently in. Angela pinched the bridge of her nose as she finally reached the same conclusion Reaper had.

"Judging by the look on your face, you're coming around to the idea's I proposed." spoke Reaper smugly.

Angela was tempted to whack him upside the head with her staff. Such an action would be out of character for her though. She blamed her current bad mood on the influence of Reaper. Normally she is practically the nicest person around, but Reaper's very presence was having an adverse affect on her. She knew the reason for it as well. Reaper is basically her polar opposite. If there was anyone in the world that she could muster up the strength to hate, it would be him.

"So, as much as I enjoy killing the local wildlife, I doubt it will get us anywhere in the long run. I suggest we get moving and try to find civilization." Reaper said as he pushed himself off the tree and started walking deeper into the forest. "You coming?" he asked as he stopped and turned around.

Angela, Bastion, and Orisa all knew just what kind of person Reaper was. Under normal circumstances they would never team up with the psychopath unless the fate of the world was at stake. However they were left with little choice right now. Trapped in an unfamiliar place with hostile wildlife, they would need to stick together to survive. It was with this reasoning that they followed the lead of the killer.