Aliens Of Justice

Welcome to Central City

High in the deep blue sky's above Bellwood, Ben currently found himself racing through the corridors of a crashing ship in his car as he desperately tries to outrace the surging blue energy currently coursing through the ship, multiple warning sirens blared on in the background while Ben fiddled with the cars dashboard, desperately trying to remember the activation code for it's rocket boosters.

"Go! Go! Go!" Ben yelled as he floored the accelerator and sharply pulled to the left, narrowly avoiding crashing into one of the ships walls. His grandpa's voice came over the car's radio, "Ben! You need to get out of there now!"

"I know!" He exclaimed sharply as he finally managed to activate the cars boosters, 'Its still not enough!' The hero though to himself before glancing down at the Omnitrix, 'Looks like it's time for an Upgrade.' Mentally commanded the device to activate causing a bright green flash of light to engulf him.

When the light faded, in Ben's place was a humanoid shaped figured covered in shiny green metal. His head and back, are covered in a deep, reflective violet. There are glowing green circuitry patterns over the purple sections. He had a singular eye on his head with the Omnitrix located on his left wrist.

"Upgrade!" He cried out in mechanical voice he began to merge with his car, covering it entirely with his body and creating an additional two rocket boosters on the vehicles.

With the extra speed, Upgrade found himself speeding through the ship unfortunately just as he was about to reach the exit, the ship was suddenly exploded in a bright flash of blue light.
...
Silence fell over the entire Plumber HQ as they looked on in shock at the screen, unable to comprehend what had just transpired.

"What... just happened?" Rook asked in disbelief as Max sat back in shock, "I don't know..." He muttered in a look of defeat on his face.

"Oh no need to worry, Mr. Tennyson, Ben's perfectly alright." Max whirled around in shock upon hearing Professors. Paradox's voice, "Paradox, what are you doing here? Where's Ben?!" The elderly Plumber demanded as he grabbed the Time Walker roughly by his jacket.

"Your grandson is currently trapped in another universe and as such won't be back for a while." Paradox reassured the elderly Tennyson. "But what does that mean for Ben?" Max asked tentatively as Paradox smiled in response.
...
Meanwhile in another universe, on an empty road not far from a massive sprawling city, a portal suddenly opened up and violently expelling the Upgrade infused car onto the street below before screeching to a halt right in front of a random gateway sign.

Upgrade groaned in pain as his body slinked off of the vehicle and reformed itself into the driver's seat before turning back into Ben, the car's indicators blinking rapidly due to the sudden influx of energy it had recieved.

The hero leaned back in his seat in exhaustion not questioning how he survived the ships destruction as the car tried to triangulate where they were, letting out multiple beeps that served to annoy Ben. After a few moments, Ben groaned in annoyance and sat forward immediately taking notice of the welcome sign in front of him.

Welcome to Central City
Home of the Flash and Kid Flash

"The heck...? Welcome to Central City...?" He muttered as he blinked in confusion, "Who's the Flash?" He questions before realising that he'd never heard of Central City.

Ben slumped down in defeat as he realised that he was most likely not in his own universe anymore. "Here we go again." He grumbled in annoyance as he started up the cars engine, "At least this time, I actually know what not to do this time." He muttered before noticing a small note on the passenger seat, frowning in confusion he picked up the note and read it before grimacing. "So I'm stuck here...?" He muttered in disbelief as he re-read the note several times before the information finally sunk in.