Supergirl, Justice League and Young justice are properties of Warner Bros and CW. I claim credit for nothing.

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CHAPTER 1: Fallen Angel

26000FT OVER THE STATE OF CALIFORNIA

"Control, we are ready to start ignition."

"Copy Ferris-1. Standing by."

Hal Jordon keyed the necessary codes into the flight navigation computer. The craft itself – which looked like a cross between a Space Shuttle and Manta Ray - was Carol's brainchild: an experimental propulsion system that supposedly used "no thrust, just electrically-generated kinetic motion."

"Just remember we got one shot at this Hal," Carol's voice chimed into his helmet. "The DEO gave us a peek at Kryptonian tech and we owe them big."

"I'm sure we can negotiate a handsome reward once we claim a production contract," Hal replied. "Switching from primary engines to Impulse Drive on my mark. Five, four, three, two, one – Mark!"

The craft's twin jet engines cut out and the experimental impulse drive came to life, propelling it upwards into the upper atmosphere. The force of the inertia sent Hal back into his seat as though he had been hit by a battering ram. He was barely able to keep his eyes open as the cloud rushed past his cockpit..

"Hal! Come in, your vital are off the chart," Carol yelled.

The craft continued to climb, as with the increase in altitude his breathing became thin. Dizzyness came over him

"I can… do this," Hal answered as he kept his eye on the altitude .

Finally there was a jerk as the tug of gravity and inertia became loose. The clear blue skies was now a field of stars.

"Hal?" Carol asked.

"Control, we are in orbit!" Hal smiled. "Course set for landing at Kennedy Space Center."

"Just remember that what comes up must come down," Carol replied. "You nearly blacked on your way up. At re-entry you speed is going to increase-"

Beep-Beep-Beep

Hal looked down to see that his power ring was blinking. His pilot's instincts kicked in and he began scanning over his shoulder to see where… there. A bright light moving downwards.

"Carol, are there any other scheduled launches?"

"Negative, Hal, we should have clear skies."

"Well we got ourselves a bogey – and I don't think it's one of ours!"

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DEO HEADQUARTERS

"Ferris-1 this is Director Hank Hanshaw, what are you seeing?"

"Have visual," Hal said. "Delta wing design. Estimate wingspan at thirty metres. Moving in for a closer look."

"Negative, Jordon, that's not a fighter you're in. It's not built to engage!"

"Duly noted," Hal replied. "You should be getting a video feed."

The screen in the DEO HQ lit up showing the view from the Ferris-1 cockpit.

"What is that thing?" Alex Danvers asked. "It doesn't match anything on the database's interstellar ship entries, it actually looks… organic."

"It's not an interstellar craft," Hank whispered with a hint of dread. "It's Martian."

"It seems to be giving off some kind Ultra High Frequency signal," Hal added. "four hundered to five hundred megahertz."

Alex's brow arched. "That's… televison?"

"Uh, the craft looks like it's in pretty bad shape. Lots of external damage," Hal continued.

"Director?" a technician called. "I've plotted a course – it's coming here, to National city."

"It's going to crash," Alex said.

Hank nodded. "Set up a recovery mission. I want Hazmat and bio-containment. We've got ourselves a fallen angel."

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A/N: And so it begins. Those who watch Young Justice will know what the Martian Bio-Ship looks like and who Alex should expect to find inside.

Next chapter: Kara attends Felicity Smoak's unveiling of Palmer Tech's latest product (cf. Arrow S04E12) and finds herself in an awkward "World's Finest" situation…