Ellie Bishop: Yeah, I planned for a Roy/Clint scene that didn't quite make it into the chapter, but it will be in the next chapter. Yep, that was largely the point of the chapter. Completely agree on Slade and Diaz. Yep.

Green Hal37: I think that Hulk probably considers Bruce his father and Bruce, disturbed by the parallels between his father's treatment of him and his own treatment of Hulk, would start to treat Hulk as his son. No kidding on Thor. Okay…

Jinero: Yep, the man was a legend.

Plane, en route to New York

Early morning

Roy sat in his seat on the private plane, deep in thought when someone sat in the seat across from him. Roy looked up to see it was Slade. It had been a bit of a shock to hear that Oliver was working with Slade. But Roy could understand something about Mirakuru madness. If Oliver trusted him, that was good enough for Roy.

"I owe you an apology," Slade said, taking Roy back.

"What?" Roy asked confused as Slade looked at him ashamed.

"When I was fixated on destroying Oliver…I used you as a means to make my army. And the events that followed…"

Slade trailed off but Roy knew where he was going. Roy going into a Mirakuru trance, which resulted in him killing a police officer and almost killing Thea. Those memories still haunted him.

"I'm sorry," Slade finally said remorsefully.

"We've all done things we regret. And I know what it's like waking up from Mirakuru, like it was some…bad dream," Roy said and paused. "What I'm saying is I forgive you."

A few feet away, Oliver watched this, glad it seemed to be going well. If they were going to work together, there couldn't be any petty grudges getting in the way of the mission. Nyssa, who was sitting next to Oliver and had fallen asleep, her head ending up on his shoulder, stirred as she woke up.

"Morning," Oliver said amused as she opened her eyes and flushed as she realized the position she was.

"Sorry," Nyssa said as she sat up.

"It's fine. It's nice seeing you relaxed for once, even if it was in your sleep," Oliver said before pulling out his phone. "We should be arriving in New York in about twenty minutes."

Avengers Compound

Morning

"So, you and Killer Frost are cool now?" Cisco asked cautiously as he and Caitlin across from each other in the living area.

"Yeah," Caitlin said awkwardly. "The two of us spent so long trying not to give the other an inch, convinced that we were in a fight for control. We forgot that it wasn't a war, that we could choose."

"Well, I'm happy for you," Cisco said and she nodded. "I just wish you'd come back, that you'd called me to let me know you were okay."

"I thought about calling you a million times. But I just…I couldn't face you after everything I'd done," Caitlin said ashamed.

"It wasn't you Caitlin, it was her," Cisco argued and she smiled weakly.

"I now that here," Caitlin said, gesturing to her head before pointing towards her chest. "I just don't think I know that here."

In the doorway, Steve watched them, feeling déjà vu as he remembered a similar conversation he'd once had with Bucky. Feeling someone approach him from behind, he turned around to see Barry standing there.

"Everything okay?" Barry asked.

"Yeah, just…thinking," Steve said as he and Barry started to walk away. "You know, Caitlin recently joined my support group, feeling guilty about not being there for Cisco. I'm glad they seem to have worked things out."

"Me to," Barry said and it was silent between them for a moment.

"How is she? Wanda," Steve suddenly asked what had been on his mind for the last few days. "You said she was with you in The Speed Force. How is she?"

"It was the hard those first few years. Not just because of being dead, but she was mourning Vision," Barry said with a wince. "She was in a really bad place those first few years. But, a century is a long time. I think, talking to me…it helped. She's…she's okay. But she'll be a whole lot more okay once we bring her home."

"You love her," Steve noted after a moment and Barry looked over at him. "I can see it on your face, hear it in the way you talk about her, you love her."

"Yeah, I do," Barry said after a moment. "It wasn't something we planned on. There's only so much time in a century alone. We talked, told each other about our lives. We weren't looking for it…but we fell in love. It's like…I can be myself with her. She knows me in a way that no one else has, the good and the bad. She doesn't judge me, even when I'm less than the perfect guy. And I don't judge her for the things she's done in the past, the things she's less than proud of. They don't matter to us; all that matters is who we are now."

Steve stared at Barry, trying to figure out why the way he described his relationship with Wanda sounded so familiar. Before he could ponder on it for too long, there was a loud bellow from down the hall. A familiar bellow. With a smile, Steve walked down the hall to see Thor hugging Bruce tightly.

"My friend, it is good to see you!" Thor said happily as he released Bruce.

"Hulk happy to see Thor," Bruce said in Hulk's voice before he spoke in his own, surprising Thor. "Good to see you to Thor."

"And you both speak! This is excellent; we must celebrate with a feast!" Thor cheered.

"Maybe once this is over, we can all celebrate," Steve said as he and Barry walked in.

"Indeed. Its good to see you Cap," Thor said as he and Steve clasped hands.

"You to Thor," Steve said, noting the light in his friend's eyes.

Thor seemed more alive than he had in…Steve didn't know how long. Like the rest of them, the hope Barry had brought had brought Thor back to life, it seemed.

"And this must be Barry Allen," Thor said as he saw Barry. "I hear that you are the mastermind behind this plane."

"I wouldn't call myself the mastermind," Barry said humbly.

"We are all here today because of you. You are the mastermind behind this plan," Thor said firmly.

"You've given us hope again Barry. That's no small thing," Steve added.

He would've said more but suddenly, everyone in the compound heard the roar of jet engines. The engines of a Quinjet.

"Looks like Nat's back," Rhodey said.

Everyone in the Compound all converged outside as a Quinjet landed in the landing zone. The ramp lowered and Natasha and Clint walked down.

"Barton, it's good to see you old friend!" Thor said jovially as he, Steve and Bruce met the pair halfway.

"You to Thor," Clint said with a weak smile before turning to Steve. "Cap."

"Good to see you Clint. I'm sorry that I couldn't stop him," Steve said but Clint shook his head.

"If you, Thor and Tony couldn't stop him, then no one could," Clint assured his leader and friend. "What matters now is bringing them all back."

Steve simply nodded, a great weight lifted from his shoulders as Clint and Bruce exchanged polite greetings. Tony approached the group and a tense silence descended on the area as Clint stonily eyed Tony. The last time the two had met was at The Raft, where Tony, in a moment of thoughtlessness, had mentioned Clint's family while Thaddeus Ross had been listening to their conversation, compromising the safety of Laura and the kids until Clint had returned home to make sure they remained safe. Judging by the icy stare Clint was giving him, Tony felt confident in saying Clint hadn't forgiven him for that blunder.

"I'm sorry," Tony suddenly blurted out.

"For what exactly? Outing my family to Ross? Or the two years of surveillance Ross had us under, hoping I'd lead him to Cap and the others? Or maybe the fear I lived with for two years that today would be the day Ross would come after my family?" Clint asked coldly and Tony winced.

"I'm sorry for all of it. I know you're not gonna forgive me anytime soon, I wouldn't either. But if we're gonna do this, I need to know if we're good," Tony said.

Clint was silent for a moment, simply staring at Tony. Then he slugged Tony, hard enough to send him down to the ground, clutching his chin where Clint had punched him.

"Now we're good," Clint said, seeming satisfied even as he offered Tony a hand up.

"Okay, I deserved that," Tony admitted as he took Clint's hand and Clint helped him back to his feet. "You pack one hell of a punch Clint."

"At least he didn't put an arrow in your back," Barry joked and Clint looked over at him. "Oliver did that to me our first training session."

"You must be Barry Allen," Clint noted as he walked over to Barry, sizing him up like he was already planning on how to take him down. "So, according to Nat, Wanda was with you in this…Speed Force?"

"Yeah. She told me to tell you to get off your ass," Barry said and Clint stared at him for a moment before he laughed, the first laugh he'd had in over a year.

"Alright, I'm convinced. At least about Wanda. Still gonna need proof about this time travel thing," Clint said and Barry nodded in understanding.

"Make that two of us."

Everyone looked over as Oliver, Nyssa, Slade and Roy, who had been the one to speak, walked over.

"Hey Roy. Good to see you again," Barry greeted and Roy nodded at him.

"Everyone, this is Roy Harper," Oliver said by way of introduction.

"We call him Arsenal," Cisco added and Roy's lips twitched.

"No one's called me that in a long time Cisco," Roy said wistfully.

"Wait, I thought he was the Arrow?" Scott asked confused.

"No, The Hood, The Arrow, the Green Arrow, all him," Cisco said gesturing at Oliver.

"So you took the fall for him?" Tony clarified as he looked from Oliver to Roy.

"It was my plan. And I would do it again in a heartbeat," Roy said firmly as he looked at Oliver, daring at him to disagree.

Slade eyed Roy, newfound respect shining in his eye. The kid had finally found a friend who was unquestionably loyal. He hadn't always had the best luck with such friends, Slade thought with a wince.

"So, time travel?" Roy asked as he looked at Barry. "I'm gonna need some proof."

"Me to," Clint added.

"Make that three of us," Slade added and Barry simply smiled.

"I knew you three would be the hardest to convince. And I can convince you right here and now," Barry promised.

"Wait wait wait!" Cisco suddenly shouted, everyone looking at him as he rummaged around his pockets. "Found it!"

Cisco pulled out a golden ring with a lighting emblem and rushed over to Barry.

"Is this Thawne's ring?" Barry asked confused.

"No, it's yours. I made it, along with your new suit, when I wasn't trying to figure out how to get you out of The Speed Force," Cisco said and Barry slowly took the ring, inspecting it.

"You never gave up on me," Barry said, genuinely touched.

"Never," Cisco promised. "But, if you're gonna do this, do it in style."

Barry chuckled before placing the ring on his finger. Barry then made a fist and the emblem opened, a Flash suit flying out. At super speed, Barry put it on and looked at his new suit impressed.

"Not bad Ramon," Harry said, trying to hide how impressed he was.

"I could make one better," Tony said and they all rolled their eyes at his antics.

"Anyway," Barry said as he turned back to Clint, Roy and Slade. "Since you three want proof, we'll do a test run. I want each of you to think of something in the past, an item, something small, insignificant. I will take you back to a point in time of your choosing, and you guys get whatever it is. When you get it, I will know and bring you all back."

"I have a question," Rhodey said and everyone looked at him. "Since we're using time travel, why doesn't Barry just go back in time and kill baby Thanos?"

"Rhodey," Steve said as nearly everyone looked at him in disgust.

"Come on, its Thanos!" Rhodey exclaimed.

"Why don't you ask Cisco and Caitlin what happened last time I did something like that," Barry said pointedly and it was silent as Cisco and Caitlin avoided looking at everyone.

"Why do I have a feeling we're missing something?" Tony asked sarcastically.

"About a year before Thanos, I went back in time, saved my mom from being murdered when I was a kid," Barry said, his face full of shame. "I created a timeline called Flashpoint, lived there for a few months. When I realized I'd made a mistake, I tried to set things back the way they were."

"But things were different," Bruce realized and Barry nodded.

"Cisco's brother was dead; Caitlin had powers and another personality that was taking her over, our friend Diggle had a son instead of a daughter-"

"Dig had a daughter?"

"Wait, you wiped out an entire person from existence?" Roy and Scott said horrified and Barry nodded grimly.

"Yes. And that was from saving someone who, in the grand scheme of things, was an insignificant spec," Barry said as he turned to Rhodey. "And that is why I didn't kill baby Thanos. Because he is far more important than my mother ever was. There's no telling what killing him as a baby would do to the timeline."

"Okay, I get your point," Rhodey said, regretting he'd ever asked.

"My barn," Clint said after a moment and they all turned to him. "Take me to my barn, one year ago."

"Verdant, Thea's office, four years ago," Roy said.

"Lian Yu, the Fuselage, ten years ago," Slade said and Barry nodded.

"Hold on, you might be a little disoriented afterwards," Barry warned them.

Barry then raced over to them and, in a flash; all four of them were gone.

Barton farm, 2017

Afternoon

Clint was thrown into the wall of his barn, his vision blurring a bit. Once it was focused, he stood up, looking around the barn in nostalgia. It had been a year since he had seen it. Exiting the barn, he walked up to the front yard, his throat tightening as he saw his home, still in such great condition.

Seeing his son's baseball glove on the ground, Clint picked it up, staring at it fondly. Then, from inside the house, he heard his daughter's voice. Whipping his head up, tears stung at the corner of Clint's eyes.

"Lila," Clint breathed.

Before could move towards the house, Barry sped in, grabbed him, and pulled him out.

Verdant, 2013

Morning

Papers went flying off Thea's desk as Roy appeared in her office. Roy breathed heavily, looking around. It was exactly as he remembered it, his heart jumping into his throat as he saw the picture of them she had kept on her desk. Roy stared at it for a moment before he grabbed the top drawer handle and opened the drawer. Roy reached in, rummaging around before he found what he had come for. Roy pulled out the Hozen and stared at it for a moment before he heard a familiar voice outside the door.

"Yes, my mother's event is being held here tonight. No I am not happy about it, so shut up!"

Roy whipped his head up, staring outside the door where he could hear Thea yelling at someone. His throat tightening, he made to move towards the door when he was grabbed from behind.

"No, Thea!" Roy cried out as he was pulled from the past.

Thea opened the door to her office, looking confused. She'd thought she'd heard…nah; Thea dismissed it as she closed the door.

Lian Yu, 2008

Afternoon

Slade appeared in the Fuselage that had been his home for quite a few years. Slade looked around, his eye getting a little misty. For all the pain that had come from this place, it had also been the sight of many happy memories. Slade took a moment to reminisce before moving on.

Slade rummaged through his old stuff before finding what he had been looking for. Slade picked up the Australian Rum he, Sara and Oliver had shared before their disastrous attack on The Amazo, staring at it with conflicting feelings before he heard a sound from outside. Slade looked out as he head his past self and Oliver bickering before he heard Shado gently reprimand them.

Slade wanted to walk out there and say all the things he had never said to her while she was alive. But Barry's warning about the dangers of time travel was fresh, so he remained where he was as Barry grabbed him and took him back.

Avengers Compound, 2018

Mere seconds after they had disappeared, the four of them reappeared in front of the group. Roy immediately sunk to his knees, looking like he was about to have a panic attack as Oliver rushed over to him while everyone else looked at Roy concerned.

"Roy? Roy, you okay?" Oliver asked worriedly as he knelt down in front of his former student.

"Yeah-yeah," Roy said breathlessly, looking down at the Hozen in his hand. "It worked."

"Kid's right," Clint said gruffly as he held up the glove and Slade held up the liquor.

"Looks like we're in business," Slade said, the fire of determination entering his eye.

Later, they all stood in the briefing room. Steve, Barry, and Oliver all stood as everyone else sat, watching and waiting for the meeting to being.

"Almost half the people in this room have had an encounter with one of the six Infinity Stones," Steve stared. "We all know how dangerous they are."

"Which is why we can't rush in half-cocked. We need to plan carefully," Oliver said, picking up where Steve had left off.

"So we need to listen to the person who knows where they are. Barry, the floor's yours," Steve said as they all looked at him.

"Like I told you guys, Thanos scattered the stones across different planets in different times. He didn't just want to keep us from getting them, he wanted to keep them from getting to us," Barry explained. "He put them in places it would be near impossible to get them out of."

Barry touched a screen and a 3D depiction of the Reality Stone appeared. Behind it was a familiar palace to Thor and Bruce, with the word 'Sakaar' above it.

"Oh you have got to be kidding me," Bruce said as he and Thor groaned and everyone but Barry looked at them in confusion.

"Afraid not, Thanos sent the Reality Stone to Sakaar, a few years before Hulk arrived there. Since you two are the only ones who have actually been there, care to fill everyone in?" Barry asked.

"Sakaar is a planet beyond the nine realms. It's run by this lunatic who calls himself Grandmaster," Thor said with a look of disgust on his face.

"Crazy man make Hulk fight," Bruce said in Hulk's voice.

"Yes, he made Hulk his gladiator," Thor added before getting back on task. "He enslaves his people with these disks that inject you with a poison. It doesn't seem to have lasting effects, but it is painful. He also has guards with highly advanced weapons that make assault rifles look like boomerangs."

"So that's gonna be a piece of cake," Tony said sarcastically.

"If it was easy, Thanos wouldn't have sent it there," Natasha pointed out.

"Okay, so the Reality Stone is on Sakaar, let's move onto the next one," Steve suggested.

Barry nodded and touched the screen, moving it aside. On the next screen stood the Power Stone in front of a grand, futuristic city with the word 'Krypton' above it.

"Wait, Krypton, like Kara?" Caitlin asked and Barry nodded.

"In our universe, Krypton never exploded, so Kara and her cousin never came to earth," Barry said before moving on. "Krypton is a highly advanced planet with weapons that make Sakaar's look like BB guns. You'll have to be very careful."

"And where is the Power Stone?" Jay asked wearily.

That's the tricky part. It's in the possession of Krypton's most respect scientist: Jor-El, Kara's uncle," Barry said and it was silent for a moment. "It was sent to him before the birth of his son, Kara's cousin. He was experimenting with it but it went horribly wrong, resulting in an explosion that crippled him. The stone was then locked away, deemed too dangerous to be handled. In order to get it, you'll need to stop Jor-El before he cripples himself."

"Wonderful, anything else?" Slade asked sarcastically.

"Yes. The building where Jor-El is conducting his experiment is the most guarded building on the planet. Try not to set off a massive manhunt while you're on Krypton," Barry said before moving to the next slide.

The slide with Krypton was replaced by a 3D image of the Soul Stone with nothing visible, the words 'Phantom Zone' appearing above it.

"The Soul Stone is going to be the most difficult out of the six stones to retrieve," Barry said grimly as everyone looked at him with a mix of dread and curiosity. "Thanos sent it to the Phantom Zone, a Kryptonian Prison. It's a dimensional gateway that traps its prisoners. No time passes inside, and those of us with powers are stripped of them upon entering. It's inescapable. And that's not even the worse part."

"What could possibly be worse Allen?" Harry asked sarcastically as Barry grimaced.

"The Soul Stone is in possession of a Rogue Kryptonian General known only as Zod. He was banished to the Phantom Zone for trying to overthrow the government. He's ruthless; he will not hesitate to kill any one of you in order to keep the stone, even if he doesn't know exactly what it is. And he has his own army of Zoners and Kryptonians as well," Barry said and it was silent for several moments.

"Not it," Scott said and got several dirty looks in response.

"Moving on," Barry said, moving to the next slide, which showed a 3D image of the Space Stone, with a picture of Loki, to Thor's shock. "The Space Stone was sent to your brother Thor, centuries before you two had your falling out. He doesn't know what it is, but he's the god of mischief."

"If Loki had it, why didn't he use it?" Thor demanded.

"When you destroyed the Bifrost Bridge, he had it on him but he lost it. Who knows where it is now, could be on Earth somewhere, could be on the planet furthest from it," Barry shrugged.

"So now we have to deal with Reindeer Games? Well this should be fun," Tony said sarcastically.

"What's next Barry?" Jay asked and Barry sighed.

"Well, there's good news and bad news about the Mind Stone," Barry said. "Which do you want first?"

"Well, I could use some good news right about now," Clint said and Barry nodded.

"Well, the good news is that this stone is actually here on Earth. The bad news is, well…"

Barry moved to the slide on the Mind Stone and, to Oliver, Roy, and Nyssa's shock, a familiar castle appeared under the words 'Nanda Parbat'.

"He gave it to Ra's al Ghul," Barry finished.

"Ra's al Ghul, as in the League of Assassins?" Clint asked startled.

"I thought that was just a myth," Natasha muttered.

"I hate to ask, but what's the League of Assassins?" Scott asked nervously as he, Thor, Bruce, Rhodey, Jay, Harry, Steve and Tony, the only people in the room who hadn't heard of it, looked confused.

"Exactly what it sounds like. A group of assassins dedicated to wiping out evil across the world," Oliver said grimly.

"At last it was, until my father corrupted it by losing his sanity due to prolonged expose to the Lazarus Pit," Nysa muttered.

"Lazarus Pit? As in the Bible?" Bruce asked startled and was met with several nods.

"Your father? You mean…" Rhodey trailed off as Nyssa nodded.

"My full name is Nyssa al Ghul. I am the daughter of Ra's al Ghul," Nyssa confirmed.

"Which actually benefits us, no one knows Nanda Parbat better than you Nyssa. You'll have an idea where your father would keep the stone," Barry said and Nyssa nodded.

"There was a room in the eastern corner of the castle. My father never allowed anyone to enter it," Nyssa realized and Barry nodded.

"It wasn't just the pit that made your father lose his mind. It was also the stone. It had such a hold on him that even he was when planning on making Oliver his successor; he still kept it on him. It's currently at the bottom of Starling Bay with his body," Barry said and it was silent for a moment.

"And the Time Stone?" Steve asked and Barry grimaced.

Barry moved to the next slide and a 3D image of the Time Stone appeared before a futuristic city, not as advanced as Krypton but still impressive above the image of the city was the word 'Titan'.

"You've gotta be kidding me," Natasha muttered as the Avengers all stared at the screen.

"Is Thanos really that arrogant he would send it to his past self?" Bruce asked incredulously.

"Yes and no," Barry said and they looked over at him. "Thanos did send it to Titan, but not to himself. He sent it to his father, years before he even met Thanos' mother. Like Jor-El, Thanos' father, A'Lars, was a respect scientist who has no idea what the stone really is. And you'll need to be careful, if you even mention Thanos, the timeline could be disrupted."

"So don't mention the guy's son sent it back to him so we wouldn't undo his genocidal plan. Got it," Cisco muttered.

"There's one more thing, something I haven't told you," Barry said and they all looked at him curiously. "I can get you to where you need to go…but taking all of you to different points in time, it will take everything I have just to get you all back safely. I won't be able to help you once you get there, you'll be on your own."

"Don't worry Barry, you've done more than enough," Oliver assured him, placing a hand on his friend's shoulder.

"Oliver's right, you've given us hope that we had lost. We can figure out the rest. There are six stones, six different locations. We need six teams to pull this off," Steve said as everyone stood up, looking as Barry brought up all the slides. "Now we just figure out a plan."

So, that's the chapter's stopping point because this ended up being a lot longer than I thought it was going to be.

The scene where Clint punches Tony was a modified scene from Raptor2216's story 'Worlds collide, heroes unites' where Barry punches Tony. Thank you to him for letting me use it.

So, Barry finally gets his Flash Ring. Honestly, I was disappointed Barry got it from Nora. It was implied I think in late season two, been a while since I've seen it, that either Cisco or Harry was working on the Flash Ring but then it was dropped until season five. Barry should have gotten the Flash Ring from either Cisco or Harry, not Nora. Or, as I call her, Iris Jr.

Barry's suit is the one from season four.

I tried to be creative with where the stones were without completely changing the history of the Arrowverse and MCU. Hope I did okay there.

Not sure when I'm going to update this again, but for now, I hope you all enjoyed it.