A/N: As always, I watch something, want to write about it, then forget before it is finished - hence why this is (probably) a one shot. Lightly inspired by "The Heretic" written by "Beyond_the_sass" on Archive of our own; throwing Harry Potter into a version of the suicide squad, in my case the 2021 movie.

'It was inevitable that it would come to this,' mused Harry, staring at the featureless grey concrete wall of his cell. 'I was always going to end up in Prison somehow.'

He was 21 years old, and had been forced to flee his home and country after risking (and even giving) his life to defend them. The sheep of magical Britain had decided that leaving such a dangerous and powerful wizard free could only create another Voldemort.

So he had left. Sneaked aboard a plane heading for America. Disguised his face and changed his name. Hoped to try and find a normal life.

But as it turns out, being a poorly educated, unqualified young adult with no papers isn't conducive to a normal life, at first, he stole to survive - but in time, he would start thriving on it. Stealing bigger and bigger prizes, until his name, Marauder, was up there with the likes of Catwoman as one of the greatest thieves in the world.

And then, he slipped up, and was left to rot here in Belle Reve.

The door to his cell swung open.

"This is Marauder. Master thief, infiltrator and magician." said a familiar figure, Amanda Waller was standing in the doorway, 2 unfamiliar men in prison uniforms behind her. "Renowned for robbing both Wayne Enterprises and Lexcorp in a single night, only to leave his spoils inside the other companies vaults." Harry smiled at the memory from his position on his cot, the chaos that night had caused had been hilarious.

Sitting upright, Harry turned to face them, his green eyes sparkling as he smirked. "So… Am I to be part of the infamous Suicide Squad? Fun."

"Magician?" The dark skinned prisoner behind Waller asked with a raised eyebrow, "What, is he going to start pulling rabbits out of hats?

"If this whole beach was filled with dicks, and someone said I had to eat all of them, for liberty. I would say 'No Problemo'"

"Why would …" Cleo started to question Peacemaker, before her gaze caught something behind him and she stifled a laugh. Peacemaker turned and stared.

The whole beach was filled with dicks.

"Well?" said Harry, a wry smile on his lips and his wand held loosely in his hand. "Are you going to get started?"

Bloodsport laughed. "That's a neat trick."

"Flag is somewhere in that camp ahead," said Waller through their earpieces. "Be careful, these people are dangerous."

"Okay. Marauder, go and scout ahead. I want to know where Flag is before we go in. We don't want to risk him being killed in case we are spotted." Bloodsport ordered.

"Got it" said Harry, turning and swirling his invisibility cloak over his shoulders, disappearing from view.

"Well, Waller's intel is a mite out," Harry said, appearing in the centre of the group, drawing a series of curses from his shocked teammates (except from Cleo, who was taking a nap against a tree trunk). "They're a group of Freedom Fighters who rescued Colonel Flag, he is in the large central tent, drinking tea with their leader."

"Alright, these people could be our ticket into Valle Del Mar. Marauder and Cleo sneak around the flank, if they do prove hostile, distract them, buy us time to get to cover. The rest of us will walk up to the front"

"So, you control Rats?" Harry asked, as the pair walked through the Jungle surrounding the camp. "That's cool."

"And you create penisis. Not quite so cool."

"I…" Harry spluttered slightly, before catching Cleo's teasing grin and laughing with her.

"Why do you call yourself 'Marauder'?"

"My Dad and his friends used to call themselves 'The Marauders', a group of infamous pranksters and troublemakers. When I turned to thievery, it seemed as good a name as any."

"DuBois?"

The team had been stopped at the entrance to the camp. Held at gunpoint while their leader was called from the centre of the camp, and with her came Rick Flag.

"Hey Flag."

"What… What are you doing here?"

"Waller sent us to rescue you."

"Rescue? Never mind." Flag said, before gesturing to the woman next to him. "This is Sol Soria, the leader of the Resistance, the freedom fighters trying to take down the current government. They saved my life."

"Yes, we guessed. Hence why we didn't come in guns blazing"

With a command from Sol, the freedom fighters lowered their weapons. Seeing that hostility was averted. Harry and Cleo appeared from behind the line of soldiers.

"Waller never mentioned putting a second team together," said Flag. "Who are they?"

"This is Peacemaker or Cristopher Smith, King Shark or Nanaue, Polka-Dot Man or Abner Krill, Ratcatcher 2 or Cleo Cazo and Marauder or…" Bloodsport trailed off, "Waller name gave me his name."

"That's because Waller didn't know it. But it's Harry"

"I wear disguise."

"Ohh, you are going to wear a disguise," Cleo said, somewhat patronisingly.

"Si"

"What kind of disguise?"

"Fake moustache"

"Yeah, a fake moustache isn't going to cut it."

"I think it is a great idea." Harry interceded, holding one out towards Nanaue. As he put it on, his form seemed to blur. Morphing into a very large human.

Everyone stared in shock. No one more so than Nanaue, looking at his reflection in the dull metal of the bus.

"Just how much are you capable of?" Bloodsport questioned Harry.

Harry just smirked once more, "That would be telling."

"But eventually, my Father's burdens became too heavy to carry, and he was gone..." Cleo's voice broke as tears fell down her face.

From the seat behind Cleo, Harry conjured a handkerchief and handed it over. "Here," he muttered, placing one hand reassuringly on her shoulder.

They sat in silence for a few moments, letting the background noise of the engine and town outside wash over them.

"He loved you very much, and he is still with you, watching over you" Harry murmured, breaking the silence, "Trust me on that"

"Thank you Harry," said Cleo, turning to face him, "What were your parents like?"

Harry smiled sadly, "I never knew them, they died protecting me when I was one. Protecting me"

This time it was Cleo resting a hand on Harry's shoulder. "I'm sorry"

"So, when is this, Thinker, guy supposed to be here?"

"Supposed to be in the next few hours."

As Peacemaker ordered drinks (making sure to get a glass for Sebastian), and they all toasted their continued survival. Harry looked around at his new team, he had had doubts at the start, but except for that 'minor issue' with Nanaue the night before they had formed a decent sense of comradery.

Eventually Cleo, bolstered somewhat by the alcohol in her system, pulled Harry up with her onto the dance floor. Who, while slightly stunned, started dancing with her.

Bloodsport cursed under his breath, turning to face Harry, Cleo and Abner. "Alright, take him out through the back. Find my coordinates in the pad and meet me in half an hour"

"What?" Cleo questioned, before Harry stepped forwards, pulling Thinker back with him.

"Come on, we'll be fine," he said, leading them out the back as they heard Bloodsport create a diversion. Cleo called a rat to dispatch the one guard there, and they then turned onto the street.

"Your equipment manipulates animal behaviour, clever. I'm working on something similar for humans." The Thinker said, looking back in interest at the twitching guard.

"Be quiet, please"

"You are perceivably panicked, I'm guessing you are not the alphas of this battalion."

"Do you want a dozen angry rodents crawling up your ass?" Cleo burst out, turning to face him.

The Thinker opened his mouth to respond, but was silenced by Harry, greatly confusing him as no sound came out of his mouth.

Rendezvousing with the rest, who had managed to crash their captors truck down a cliff. They set off towards the centre of the city, where Harley was being held captive.

"Okay then Harry, do your thing, scout the building out." Bloodsport ordered as they arrived. Harry stepped from the bus, vanishing once more.

Under his invisibility cloak, Harry walked inside unnoticed, mentally noting the number of soldiers inside, before the sound of gunshots caught his attention. Heading towards the distraction, he saw Harley wielding a golden javelin and tearing her way through the soldiers.

Seeing one mortally injured soldier holding a gun out towards her unnoticing back, Harry stepped forwards, a disarming jinx pulling the gun out of the soldier's hands as it fired, slightly missing Harley, before Harry stunned the soldier.

"Why did we ever think you would need us to come and rescue you Harley?" Harry said, dropping his invisibility. He had met Harley once before, during a brief stay in Gotham, where he had swiped a prize Catwoman had her eyes on, much to Harley's amusement.

"Marauder? Wait, what…" Harley's voice trailed off as her mouth hung open in shock.

"Yep. Waller sent two teams here, and was perfectly content to use yours as a diversion. Flag and the rest are outside"

"So what have you got, is she still alive?" Flag asked as Harry entered the bus.

"What I have is a question. Why did we think Harley Quinn would even need rescuing?" Harry said, gesturing behind him to where Harley climbed into the bus, then rushed at Flag, pulling him into a hug.

"You really came back for me?" Harley asked tearfully.

"Of course."

Pulling away from Flag, she turned to the rest of the team and introduced herself, "Harley Quinn, nice to meetcha."

Entering Jotunheim the team Split up, Cleo and Flag took Thinker down into the bottom level, Peacemaker remained on the bottom floor while the rest moved to lay down the explosive on the upper levels.

Harry had teleported to the top floor, working his way down the building; he had managed 4 floors before he heard an explosion beneath him and the upper section of the building began to tip.

Running upwards, shattering the window with a curse he flung himself through it, before slowly hovering downwards onto the remaining building, where he saw Bloodsport's grappling hook detach, and fall backwards

Watching Bloodsport collapse down through the floors, Harry dropped down after him - using magic to slow his descent and landing at the same time. What they saw down there chilled Harry's blood to the bone.

Peacemaker, covered in blood splatter and without his iconic 'beacon of freedom', stood over Cleo, who was lying on the floor looking up at him, his gun pointed at her head.

Even as Peacemaker and Bloodsport moved, aiming for the other, Harry acted. Apperating forwards with a crack and unleashing a lethal reducto into Peacemaker's chest. The treacherous mercenary was flung back against the rubble, even as most of his internal organs were pulverised. Moving forwards, Bloodsport stood over the dying man, ending his life with a single bullet.

Harry pulled Cleo to her feet and into a strong hug as she wept, tears flowing down her face.

"He… he killed Colonel Flag," she sobbed, "Flag wanted to give this to the press, it's proof the American Government was behind Project Starfish the whole time."

Bloodsport walked over and took the drive from Cleo, thinking for a moment before shoving it into a pouch on his gauntlet.

Harley and Abner climbed down from the upper levels, even as Nanaue walked in the front, gnawing on a soldier's skull. The team left the building, watching in awe as the giant Alien Starfish climbed out of the ruins.

Watching as Bloodsport warred with himself, Harry was similarly unsure. While his 'saving people thing' had been rather effectively beaten out of him, he still wanted to save those civilians from their fate. As Bloodsport made up his mind, turning back towards Starro, Harry acted. Ever since the small explosive had been implanted, he had been wracking his brains trying to think of a safe spell to remove it, and he had figured it out - a bomb can't explode if its not a bomb.

With a flick, his wand was in his hand and he concentrated, visualising the explosive transform into a harmless lump of bone. Over 5000 miles away, Waller started to fume as her power over the group was removed.

"Well, Waller's bombs are a touch too… nonexistent to kill us," Harry drawled, "Let's go kill a starfish."

Harry had fought many fantastical things over his life, from a Dragon to a 60 foot Basilisk - but even they paled in comparison to Starro's durability. It seemed to naturally repel magic, blasting and piercing curses just dissipated on its hide, even his limited arsenal of 'darker' magics had no effect.

The Polka-Dot Man's powers, however, had no such weakness. A stream of polka-dots surged into one of Starro's limbs, tearing it to shreds - much to Abner's delight. So much to Abner's delight in fact, that he failed to notice the other limb bearing down on him. Without a thought, Harry teleported down - summoning his strongest shield as he desperately hoped it would work.

And it did, barely. Rather than being splattered into a paste, they were both flung backwards striking a wall. Hard.

His vision swimming, Harry desperately tried to cling to consciousness. He saw Starro's form slowly be consumed by black, before collapsing, even as he drifted into unconsciousness.

Waking up with a groan, Harry felt his head on something soft. As he opened his eyes, he saw the dark green eyes of Cleo staring down at him in concern and relief.

"Did we win?" he rasped, his voice hoarse.

"Yes," she said, smiling. "Starro's dead, Robert is blackmailing Waller. We're free."

"Abner?"

"He's alive." Cleo confirmed, "You saved him."

"Good," Harry said, forcing himself to sit upright, leaning against the wall next to Cleo.

They sat still for a while.

"So… What are you planning to do now?" Harry asked, breaking the silence.

"Ohh, I have a few ideas."

"Like…" Harry was silenced as Cleo leaned forwards, pressing her lips against his - but he returned the kiss with passion.

"Awww, aren't they so cute."

At Harley's excited exclamation they pulled apart, their faces flushed, to see the rest of the team had walked over.

"Our ride is almost here," said Bloodsport, gesturing to an approaching plane. "We've got a way back to the States, after that we are birds in the wind."

The trip back to America was uneventful, Cleo slept with her head resting against Harry's shoulder, who was watching Bloodsport slowly overcome his fear of rats. Waller was true to her word and they were dropped off at an abandoned airstrip.

They all went their separate ways, with a promise to try and keep it touch. Bloodsport to Louisiana to ensure his daughter was safe. Harley went back to Gotham, dreading (and looking forward to seeing) what chaos Cass had got up to without her. Abner to Metropolis and Nanaue to California (Harry gave him a portkey, he could hardly use public transport) Harry and Cleo went to one of Harry's safehouses, content for the moment to enjoy each other's company.

A/N: If you have got this far, I hope you liked it. It's hard to try and balance people when thinking of Crossovers, in this story Harry isn't a combatant, he's a thief - hence why he couldn't just summon fiendfyre and one-shot Starro.

I will probably have lost all interest in Suicide Squad by the time I'm in the mood to write again, but I might end up doing a sequel with Harry, Cleo and maybe the rest of them involving other aspects of the DC universe. If you would like to see that, let me know.