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Prologue...

16 years ago...

All was quiet one night in a city that is home to a rapping dog we all know and love, the silence was shattered by the sound of cars speeding through a street. A street race was underway and in the lead was a red luxurious sports car, and a orange sports car was behind it, trying to catch up, inside both cars were silhouettes of dogs, one was big and muscular, the other was short and thin and wore a familiar beanie hat. The driver soon pushes his ride to the limit, as the race begins to get intense, until a tanker truck pop out in front of the cars and all three vehicles begins to swerve and crashing ensued, afterward, the big dog started limping forward to the other driver, the street light revealed the big guy's identity:
Joe Chin. Joe approached the short dog driver, but stopped and looked to his right and then retreated. The driver looked at the tanker truck wreckage which is now on fire, but before he can react, the tanker exploded.

Hell, Modern Day...

A black stretch limousine with a orange stripe in the middle of both sides is cruising around Imp City, a male voice soon said...

"It's funny how fame changes a person, there was no escape from the it's pressure, no matter how much you try to run from it, much less, ease it. Still, i'll never understand what fate and destiny had planned for all of us, and the only thing we must do is go along for the ride."

The camera then points to the driver of the limousine, Gaster, and sitting next to him is Groober, their fur has lost some color, and both have small horns, and are wearing shades to conceal their eyes. Gaster's ears have gotten pointy and is wearing a chauffeur uniform, Groober's body is now muscular, and is wearing a fancy black suit. The camera changes again to Blitzo who is occupying the limo, but he was not alone, sitting in the other end is the vehicle's owner, whose identity is concealed in the shadows,
although he is short in size and his eyes are orange.

"A ride that was my last, because that damned chinned ego freak left me to die, but now after 16 years of toil and bloodshed for the overlord title, it's time for HIM to pay! So, if you want to continue killing people up there, you will bring that fuck-ugly piece of shit to me... ALIVE! I want to kill him myself!"

"Uh yeah, you know, we charged an ungodly amount of cash for bringing lives ones to our clients here in hell, but if it will make up for me trying to steal for your fine establishment, i'll make an exception." said Blitzo.

The limo stops in front of the I.M.P. building, Grobber opens the limo's passenger door, grabs Blitzo and tosses him into the ground. A grimoire is tossed to the ground near Blitzo.

"It's a spare, don't lose it." the voice told Blitzo. "You fuck this up, and you'll be target practice for my firing range."

Groober kicks Blitzo in the face and then gets back inside the limo. The vehicle drives away as Blitzo gets back on his feet growling...

"Goddamn corporate tyrant overlords!"

Author's note: Here it is, the prologue for the first ever Parappa The Rapper/Helluva Boss crossover fanfic. And how did Blitzo got this job? all will be explained in the first chapter, but i'll say that imp was stupid enough to try and steal from one of the most powerful corporate overlords in hell, whose idenity will be revealed later on in the story.