[Here's the usual, I don't own Fallout or Doom so all rights belongs to the companies that made them. I hope you like this crossover because this was probably one of the only few crossover projects that was actually working for me. There was different crossover ideas for Doom and this one manage to have a decent story to it so hope you enjoy the prologue. I also added two special guest characters in this story, so all credits belongs to the companies and not me.]

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The largest Demon that Doomguy has ever seen falls before him, after pumping a lot of rockets into the expose brain and delivering the killing blow to end the war. The Icon of Sin lets off a terrifying cry of pain that can be heard across Hell. The horrendous head of the Icon of Sin would shrivel up and dies.

Doomguy has once again remain triumph over the armies of Hell. The invasion is over. Earth could finally recover from this terrible accident that almost cost the deaths of so many people across the world. Now that he could finally stop, he swipes the sweat off his forehead and begin the long walk back home. Rebuilding his life will be the most challenging thing of them all.

For the next few years, Doomguy was a mystery, and the world believe an avenging angel came down from the Heavens and prevent total annihilation to humanity. When it was over, this angel would return home. Only a few would know the truth, and Doomguy would continue to move to find his new purpose in this world. He would set out on his bike and became a biker with a long beard and made himself a single biker gang to stand above the rest of them. He calls it 'Slayer'.

However his time as a biker would come to an end when he found her. She was looking for him for a time, and decide to help him face the real nightmares that remain haunting him everytime he closes his eyes. Long ago she fail to help him when he came back, so now she has her chance to be with him again, and she is not letting go of him.

While the two was beginning to have a life together, the new change was coming to this world. Thanks to the invasion from Hell, the years of consumption of resources was beginning to make things much difficult. The world was about to begin a new world, and humanity is about to face another annihilation.

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August 3, 2077 08:00 Hours

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Doomguy was not having a good time right now when still experiencing the nightmares. He saw himself gunning down the hordes of Demons with the chaingun, until he finally ran out of ammo and left to fight with his bare fists against them. They manage to overpower him and held him down to the floor, then proceed to rip the flesh off his body and delivering a slow painful death to him. He would finally wake up, breathing heavily and sweating under the blanket, and his heart was beating fast.

After a couple of seconds of trying to calm himself down, he leaves the room to go to the bathroom to wash his face. He sighs deeply after feeling the cold water splashing across his face. He remain standing in front of the mirror with both hands against the sink and wearing grey pants. His appearance has not change much, his hair is short and still had a muscular physique of a bodybuilder.

His wife enters the scene and calls out to him "Are you alright?" She remain standing by the doorway.

He turns towards her to see her in her white nightgown on and let her blonde hair down. Of all the people on Earth he had to pick, he manage to marry one of the best and strongest soldier. Samus Aran (That's right. It's her). Samus was among many that manage to fight back against the invaders, and the only few to know it was Doomguy that did most of the work. While he was busy wiping out a large percentage of the demonic threat across so many places, the ones that were lucky enough to avoid his presence would continue to do more damage to Earth. Samus and other elite members would contain the threat and eliminate the surviving Demons. There was also a time where the two actually work together on destroying the Demons surrounding them. He would say his farewell to her and chooses to venture deeper into Hell by himself, while she remain on Earth to help defend the population. When he came back after fighting the Icon of Sin, he was in a bloody mess and collapse against the wall with his double barrel shotgun still in his hand. Samus came over to help him by taking off his helmet and seeing his face for the first time.

"It's the nightmares again, isn't it?" Samus asks him. He looks back at the mirror and says nothing to her. She decides to get close enough to get her arms around his waist and press her body against his back. While she leans her head against his back, she says to him "I'm here for you."

Doomguy moves both his hands against her arms and responds "I know."

Samus moves her head off his back and rests her chin against his shoulder "Hmmmm, as much as I like to see you without a shirt, I'd like to have the mirror now."

"Alright." Doomguy was done looking at his own reflection and turns away to travel to the lounge room.

The house they live in is overly large for the both of them. It was a two level house with two bedrooms, single bathroom, workout room, utility room, storeroom, and the main open-plan kitchen and lounge. He came to the lounge room to find the robot butler, named Codsworth, organising breakfast and already a cup of coffee for him. Samus was the one who thought buying a robotic butler would be a good idea to help with the cleaning around the house.

"Ah, good morning, sir!" Codsworth replies with a cheerful voice towards him. He places the coffee he already made on the table and continues talking "Your coffee. 173.5 degree Fahrenheit. Brewed to perfection! And today's newspaper, just delivered!"

Doomguy takes the coffee for a taste to find it was perfectly fine. He looks back at the copy of Grognak the Barbarian that was left next to his coffee. There was a rumour about making an actual movie of Grognak the Barbarian, and Doomguy would be one of the perfect candidates to play that character.

"Enjoy your coffee, sir!" Codsworth replies and continues to serve up breakfast for the both of them

After drinking more of the coffee, he turns his attention to the newspaper to find it still the same as last time. He sighs with annoyance at hearing these news and decides to sit down on the couch to watch a minute of television. He got a chance to see a commercial of the Fat Man Nuke Launcher.

Meanwhile, Samus came down the hallway and looking gorgeous as ever. She now wears proper clothing, while her original bodysuit was left somewhere else, and will take it out on some 'special' occasions.

Samus stands behind the couch to see the commercial he was watching.

THE FAT MAN

Tactical Nuclear Catapult

ENLIST NOW

Demo One Today

Samus shakes her head and looks down at Doomguy "You're not buying that." She replies and smirks when seeing him turning his head to look back at her with a straight face, but a hint of unhappiness in his eyes. She finally chuckles and softly slaps his face with a white shirt. "Put this on."

After that, the two hear the cry from the baby in the other room. Their son was so loud they cannot hear the television right now.

"Ah, sounds like someone made a stinky!" Codsworth replies and already begins hovering towards the second bedroom where the crying is coming from "I shall attend to young John."

Samus sits down next to Doomguy and sighs in relief "You know, I was nervous at first when deciding to buy Codsworth, but he's really good with John."

Doomguy was done putting the shirt on and leans back to continue watching television. Samus leans against him and smiles at the warm comfort of her husband. She asks him "Are you feeling better now?"

"I'll be alright." Doomguy replies and lifts up his left arm to get it around Samus' body.

"You know, with all this talks of a nuclear war, so glad you took the time to talk with that salesman. I know you still believe it'll never happen, but it's good to know we still have a future together no matter what happens."

"For you and John, I'm not going to lose any of you."

Samus smiles and kisses his cheek "Hmmm, so glad you're not the silent type anymore."

"I have my moments."

"Sir." Codsworth returns to the lounge to get both their attention. "John has been changed, but he absolutely refuses to calm down. I think he needs some of that 'paternal affection' you seem to be so good at."

Samus moves off of Doomguy and responds "Go on, I'll be right there in a second to help, okay?"

Doomguy gets off the couch and walks down the hallway to see his son in the second bedroom. He walks up to John's crib to see him unwell. He lowers his right hand down to gently move his finger across his cheek for the child's attention. John would calm down at the sight of his father beside him and giggles at the feel of his hand tickling his belly. He could not help but show a soft smile towards his son because he is so precious to him.

"How are the two most important men in my life doing?" Samus calls out when standing by the doorway. She came over to be beside the both of them and looks down at John "Hey, how's my little guy? Much better now, huh?" She then lowers her hands down to pick him up to keep him against her.

After bouncing John a couple of times to get him happy, Samus looks to Doomguy and responds "Listen, after breakfast, I was thinking we could head to the park for a bit. Weather should hold up."

Doomguy nods and replies "Yeah. I could use some fresh air."

And with that the three leaves the room together to return to the lounge. During halfway, Codsworth calls out to them with concern voice. "Sir? Mum? You should come and see this!"

Everyone comes together in front of the television to hear the sudden new development.

"Followed by… Yes, followed by flashes…" The news anchor spoke with a concern look on his face. He continues "Blinding flashes. Sounds of explosions… We're… We're trying to get confirmation…"

"What did he say?" Samus asks when looking to Doomguy. She looks at him with fear and worry on her face, while Doomguy stares at the television with a slight sign of anger.

"They wouldn't dare…" Doomguy mutters and close both his hands to make a fist.

The news anchor continues "But we seem to have lost contact with our affiliate stations… We do have… Coming in… Confirmed reports. I repeat, confirmed reports of nuclear detonations in New York and Pennsylvania. My god…." After that the channel went off and came back with a screen saying 'Please Standby'

Doomguy looks back to Samus and back to John in her arms. He says this to her "We need to get to the Vault, NOW!"

Samus nods and quickly turns around to go straight out the door.

Both of them round outside onto the streets, noticed everyone outside has already heard the news and began to panic. The loud speakers nearby was calling for everyone to head for the Vault. Some people are already on their way there, while others are busy holding each other together and trying to pack whatever they can.

Doomguy could easily outrun Samus, but he chooses to remain behind her to make sure the both of them arrive at the Vault first. The three of them are very close to the Vault, so this only took them a minute for them to reach the fence. A large crowd was already there, but only a few of them had permission to pass through the sentries and into the entrance to the Vault.

"If you're in the program, step forward." Said one of the soldiers guarding the gate with two men in power armour.

Samus pushes through with John still in her hands to reach the front. She reaches the front, but looks back to make sure her husband was still beside him. She looks back at the soldier and replies "We need to get in. We're on the list."

The soldier looks at the three for a moment and then looks at the clipboard "Infant… Adult male… Adult female… Okay, go on ahead." The soldier steps to the side to allow the three to enter, then steps back where he was and prevent the people from forcing themselves past the fence.

"What's going to happen to all those people?" Samus asks when continue to run up the hill with some of the security guards.

"We're doing everything we can, now keep moving." One of the securities said.

The three arrives with the lucky ones on the main platform from the Vault. One of the men shouts out to them "Step on the middle platform."

Samus stands in the middle with Doomguy standing on her left side. She holds his hand tightly and looks to him "We're going to be okay. I love you." Then looks back to John and continues "Both of you."

Doomguy holds her hand and responds "I love you too."

And just after saying that, a bright flash of light appears in the distance ahead of them. Everyone was left surprise and startles at the sight of an actual nuclear detonation so close. Everyone panics and screams at the sight of the mushroom cloud, but the real danger was seeing the shockwave coming towards them.

"Bring it down. NOW!" Shouted from one of the soldiers that stands off the platform.

"Oh no…" Samus tightens her grip on Doomguy at the fear that this was actually it for everyone here.

Doomguy decides to stand in front of Samus in an attempt of protecting her from what comes next.

The platform would finally lower down before the shockwave could reach them, and avoid the incoming hot air that blows right over their heads. Everyone on the platform was completely safe down under, but everyone else on the surface became unfortunate. Everyone had finally made it out alive.

The platform descends further down where you cannot even see the light on the surface anymore. Everyone could finally be relief to see themselves made it out alive in one piece, but they still remain shiver with fear when seeing what just happen on the surface.

"We've made it…." Samus replies to him, but her hand still remain holding onto his hand tightly.

Doomguy moves his left hand across the side of her face to moves some strands of her hair to go over her ear. He looks back at John, who continues to cry throughout this whole thing.

"Everyone please step off the elevator and proceed up the stairs in an orderly fashion." Said one of the men guarding the main gate to Vault

They all did what they were told and walk together in a straight line off the platform and walking up the metal staircase that leads to the main interior of the Vault. Everyone here was lucky to come here earlier, and have already got to work putting on their new suits that they will be wearing for now on. The newcomers will be given the jumpsuit to wear.

"Take a Vault suit then head down the hall." Said the one offering the suits to everyone that came through the elevator. "Each of you take one of these, your brand new Vault suits."

Samus sighs at the sight of the blue jumpsuit given to her "Just like old times." She mutters and proceeds to walk down the hallway with the jumpsuit in her left hand, while still keeping John on her right.

Doomguy takes one and follows the doctor down the hallway with Samus in the lead. The two would be given privacy when putting the suit on, then re-joins the doctor on showing them where they will be staying.

"How long do you think we'll be down here?" Samus asks

"Oh, we'll be going over all that in orientation." The doctor replies and continues walking 'Just a few medical items we have to get through first."

The room he took them in was a cryogenic room with pods on both sides of the walls. They saw a few people already going inside of it, and have been waiting for them to arrive so they could put everyone to sleep in one go. As much as Doomguy was not a fan of this type of thing, but Samus was willing to go through this and enters the room first to reach her pod.

"Just head to the end and step in." The doctor says with a smile.

Before Samus could step into her pod, she turns towards Doomguy and kisses him for a while, as if this was going to be a long time since she will get the chance to kiss the love of her live. Doomguy kisses her back, then looks back at John when Samus breaks the kiss and sees him acting so calm right now.

"I'll be right here. You've got nothing to worry about." Samus replies and turns away to walk straight into her chosen pod.

Doomguy turns away and goes into his pod. The two try to get comfortable inside this pod, while the doctor comes to stand in between them to say a few words to them

"The pod will decontaminate and depressurize you before we head deeper in the Vault. Just relax."

"Time for a whole new life." Samus mutters and looks up to see the pod doors slowly being lower down to position to seal them tight inside. She looks back towards Doomguy to see him breathing a little more heavily than her. When he looks back at her, she presses her hand against the window pod, and waves happily towards him and smiles towards him.

"They're going to be alright." Doomguy mutters when staring back at Samus.

"Resident secure." Said the female announcer inside the computer systems. "Occupant vitals: Normal. Procedure complete in 5… -"

As the countdown begins, everything starts to get colder inside every pod to a point where nobody could move and remain forever left in a dormant state for a long time.

4…

3…

2…

1.

Everything cuts to blank.

This was the end of the old world.

And the beginning of the new world.

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"Manual override initiated. Cryogenic stasis suspended." The voice came from the computer again

The effects of keeping them asleep was beginning to wear off in just a couple of seconds.

While Doomguy was slowly getting his eyesight back, he saw a mysterious woman entering his sight with a different suit on. This woman would look to Samus' pod and points at it, while looking back at someone off screen.

"This is the one. Here."

Another mysterious person steps into the sight and stands on the other side of the pod. The male figure looks to Samus' pod and responds "Open it."

Her pod was the only one that opens up, while everyone else was still stuck inside their pods. When her pod opens, she falls forward and coughs deeply over the effects of waking up from this long sleep. This also cause John to cry once again.

"What's happening?" Samus asks "Are we alright?"

The man on the left responds "Everything's going to be fine."

The woman in the suit steps closer to Samus and stretches out both her hands to attempt to take John out of her hands. She thought they were here to help her get out, but she wish to get out while still keeping John in her hands.

"Come here… Come here, baby…" The woman continues to insist on taking John out of her hands.

Samus shakes her head and keeps a hold on John "No, wait. No, I've got him!"

The man takes a step forward and lifts up his right hand to aim his gun towards Samus. "Let the boy go. I'm only gonna tell you once!"

The sight of him pointing his gun towards Samus was making Doomguy's blood boil. He attempts of punching the thick glass through with everything he got in order to save her.

"I'm not giving you John!" Samus responds

"NO!" Another voice suddenly calls out for everyone's attention. The man with the gun would lower it down and step back to allow the next character to enter the eye shot of the two of them.

Out of nowhere, a tall robotic figure that was twice as tall as anyone in the room. He enters the scene to stop a future event that would cause the extinction of everyone in this room, as well as the organisation they are working with. The robot looks to Samus first, then turns around towards Doomguy and steps closer towards him.

"She'll live. Take them both."

"Understood." The woman obeys and decides to help Samus out of the pod. She also apologises for what happen here, while continue to help Samus walk out of the room.

"What about the rest of them?" The man with the gun says to the tall robot

The robot moves back to stand up straight and replies "They can go free. But he must stay."

The man walks away, but the robot remains looking at Doomguy and says one last thing to him "I won't kill you, but I can't have you stand in my way. Until we meet again." And with that he walks away.

"Cryptogenic sequence reinitialized." The computer announcer replies and causes Doomguy to return to his frozen state. He continues trying to break the glass, but the freezing effect took only a few seconds to finally kick in and bring him back to sleep once more.

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[That concludes the end of this prologue. Hope you like the intro and hope you like the rest of the story. As for the whole thing with Samus, always wanted to try a Samus x Doomguy type of story and this story is probably one of the only Doom projects that actually works right now for me.]