After an unusually quiet few days, National City is attacked by hundreds of alien ships. Kara, Alex and Maggie work together to defeat the enemy, but an accident has potentially serious consequences.

"I totally kicked your ass," Alex gloats in her best know-it-all voice.

"You did not!" Kara jibes back. "One more move and I'd have had you."

"Yeah, yeah," Alex jokes, playfully nudging her sister as they make their way from training and head towards the main room.

A gentle breeze flows through the open doors that lead onto the balcony and fills the room with the sweet scent of fresh air.

Alex and Kara find J'onn hunched over the large round table in the centre of the room, his eyes closed and his hands massaging his temples.

"J'onn, what's the matter? Is everything okay?" Alex asks, leaning over the table so that her head was at the same height as the director's.

"Yes," J'onn states. "That's the problem. There has been no criminal alien activity for three days. I'm missing something." He begins to pace, his eyes trained on the floor.

"I'm sure it's nothing," Alex tries to reassure him.

"Is there anything for me to do?" Kara asks. "We've trained every day for the last three days, I've completed a string of tests and I was even Alex's target in shooting practice." She slumps against the table looking bored.

"I suppose you could go and help Alex in the lab. Other than that, no. Nothing's happening and I want to know why." J'onn thinks for a moment. "AGENT SCHOTT!"

"Yes Papa Bear, Director, sir?" Winn mumbles as he scuttles out of his seat to stand next to the director.

"Run the checks again," J'onn commands.

"Absolutely," Winn stutters as he clumsily makes his way back to his desk, tablet in hand.

"I guess we'll be in the lab, then," Alex says, looking at Kara.

"Hey, can we just take a minute?" Kara asks as they walk up the stairs in the direction of the balcony.

"Why, feeling tired from your defeat?" Alex jokes.

Kara pulls her best 'very funny' face as they overlook the city that is bathed in the warm summer sun. They stand in silence for a minute, taking in the beauty of the day and watching people strolling in the park.

"What're you doing for date night with Lena?" Alex asks her sister.

"We're going to her favourite restaurant," Kara says. "It was her turn to choose."

Alex nods her understanding.

"What about you and Maggie?"

"The Barenaked Ladies are playing," Alex replies, beaming. "And then maybe pool at the bar."

"That does sounds like a fun date night," Kara says. "Are you ready to-"

"Do you see that?" Alex interrupts her sister. She's pointing to a dot in the sky that seems to be getting larger and closer to the ground with every passing second.

Kara follows Alex's finger and stares at the object. "Yeah," she says, perplexed.

They watch as the dot begins to take shape.

"Uhh, J'onn!" Alex shouts, unable to tear her eyes from the object that was clearly some sort of ship.

"Oh my Rao." Kara's voice is little more than a whisper, but Alex still hears.

And then she sees what Kara had seen.

Hundreds of little flecks fly in perfect formation, following their leader, until they begin to break away in twos.

Alex and Kara don't stop to see the rest.

"WE HAVE A CODE RED," Alex bellows as she storms inside, hitting the emergency button on the wall with force.

"What's going on, Agent Danvers?" J'onn asks as Alex and Kara approach the centre of the room.

"Hundreds of ships have just appeared from nowhere, sir," Alex says. "They're descending on the city as we speak."

"Agent Schott?" The director says, prompting the agent for an update.

"Our satellites are showing a full convoy, sir. They're landing across the city. Intentions are currently unknown, but the lead ship is now grounded in the park outside."

"Draw up CCTV," Alex commands as J'onn gives orders to other agents.

Winn swivels into his chair and brings up various images from across the city. Each screen is filled with people fleeing from grey ships.

"Any idea who they are and where they're from?" Kara asks, placing her hands on her hips.

"Nothing yet," Winn replies as he runs multiple scans of the ships.

"You might want to hurry it up," Kara says, concern creeping into her voice. "They're getting off the ships."

Kara, Alex, J'onn and Winn watch the monitors as figures begin to disembark. From the images, they can see that the aliens are taller than humans, although not by much. Each one holds a gun, their holsters lying empty across their backs. They begin to take aim at the scattering people.

"Agent Danvers, get a team and take care of the lead ship in the park," J'onn commands, receiving a brief nod from Alex before she strides away purposefully.

"Supergirl," J'onn begins, but upon turning on his heels, he sees that the Kryptonian has already disappeared, likely to the park where she knew that she could protect her sister. "Winn, keep me on a rolling update." The director exits the room to join the fight.

/

Alex fires off a quick text to Maggie.

Mother ship in park.

She zips her phone in the pocket of her tactical gear and picks up her DEO-grade gun.

"Okay team, let's go!" Alex shouts.

They all file outside and head in the direction of the park.

Chaos awaits them.

Multiple ships have now landed on the grass and aliens continue to pour out in throngs, taking aim at the scarpering people who were picnicking and sunbathing until a few minutes ago. Alex sees Kara fighting in the centre of the park, close to the monument. The aliens gang up on her but are no match for her in combat as she drops them to the ground with a single punch.

"Fire at will," Alex commands to her team, who utilise Kara's distraction to their advantage.

Her phone buzzes in her pocket. She whips it out quickly to see a response from Maggie.

ETA two minutes.

Alex quickly pockets her phone and begins to shoot at the sea of aliens as her team use trees and benches for cover.

"Winn, do you have any idea who these guys are?" Alex asks over the comms.

"Still nothing," he replies. "I'm running more checks."

"Damn," Alex exclaims. She heads towards her sister, shooting several aliens as she does so. She takes cover behind the monument, allows her blaster to recharge and peers around the corner to assess the ship. In doing so, she sees her team fighting the hordes. She witnesses the power of the alien tech as it sends the DEO agents crashing to the ground in heaps. Each blast that connects with a person shocks them, causing them to writhe and seize on the ground for a few seconds before their bodies become completely motionless.

"Got it!" Winn exclaims down the comms. "They're Drazans."

"And?" Alex prompts him for more information. "Do you have anything about their weapons? Each shot causes some sort of seizure and then it just stops."

"There's really not a lot of information," Winn bumbles. "It seems that their shots cause temporary paralysis as opposed to death, but that's all the database says. Oh, and J'onn is helping to fight them off at the harbour."

"'Kay, thanks," Alex says. She catches Kara's eye, knowing that her sister had heard everything Winn had said. The agent gives a slight nod before standing in the open and beginning to fire again. They work as a team with Kara knocking back aliens for Alex to blast until a few shots rain in their direction, causing Alex to have to retreat back to cover.

She turns to see Maggie and a squad of NCPD officers joining the fight. The tiny detective never misses a shot as she makes her way towards her girlfriend.

"What've we got?" Maggie asks, checking the rounds in her gun and reloading.

"Drazans, that's pretty much all we know," Alex replies, looking at Maggie.

Kara appears from the other side of the statue and crouches with Alex and Maggie.

"We've got incoming," she warns, signalling for the women to look in the direction she'd just come from.

The three women sneak a glance. Disembarking from the ship is a Drazan who stands a foot taller than the rest. It has its talons wrapped around a larger, more serious-looking gun and growls before showering the DEO agents and NCPD officers with rounds.

"Okay, I'll distract him," Kara says. "You guys take him out from this angle."

Alex and Maggie give curt nods. While Alex would prefer that her sister wasn't using herself as a target for anyone other than her, she doesn't have a better idea.

Kara flies into the air, ensuring that she's within the Drazan's field of vision. His attention snaps to her and he changes the direction of his fire. For the most part she's too fast, but when a few of his shots do connect they send little shocks through her body and her skin stings like fire, though not enough to harm or deter her from the fight.

Below, Alex, Maggie and the rest of the armed teams intensify their fire.

The Drazan growls again, angered, but he doesn't relent his attack. His minions respond to their leader's command by fighting back.

"We need to be closer," Maggie states. She and Alex step around the monument into the open knowing that the Drazan won't be expecting it.

"How is that guy still alive?" Winn asks. He can see everything as it unfolds but doesn't know anything about tactics, so he can't offer them any advice.

"He won't be for much longer," Kara hisses. Heat vision blares from her eyes with force. The Drazan screeches, cries out with pain as his body burns. He's flung backwards but manages to fire one last blind shot before he crumples to the floor with a thud.

"MAGGIE!"

Alex's chilling scream rings around the park.

Kara looks down from her vantage point. Maggie is laid strewn across the grass, unmoving, with Alex at her side.

"Maggie, Maggie," Alex repeats over and over, trying to shake her girlfriend back into consciousness. "She's not seizing, why isn't she seizing like the others?" Alex is shouting to no one in particular as Kara lands on the other side of the unconscious detective.

Winn says something but no one really hears. They're too preoccupied with the motionless body between them.

Alex presses her ear to Maggie's chest, hoping, praying, desperate to hear the thump thump thump of her heart or feel even the slightest rise and fall of her chest.

Kara waits expectantly for confirmation that Maggie is alive, her eyes focused solely on her sister.

Alex lifts her head. Her eyes are threatening to overflow with tears and her bottom lip quivers. Her trembling voice is barely a whisper.

"She's not breathing."

Note: I hope you enjoyed the first chapter, let me know what you think!