Planet Vampa: Impact Crater
Age 774
"Knowing you have no chance of victory, and yet you still fight on? You have my respect: you are truly worthy of your saiyan blood!"
"Huh? Kakarotto? What does that mean?! Is that vegetable? I hate vegetables!"
"Lemme get something straight with you. Some friends call me Kakarotto. But my name's Goku, and you're not my friend!"
"Have... have Broly's instincts as a saiyan been awakened by Kakarotto's power?!"
"SOMEONE HAND ME A BETTER DAGGER SO I MAY PROPERLY STAB THIS BABY!"
The quasihibernating saiyan writhes in his sleep, his mind ravaged by concussion and the sheer power convulsing on multiple metaphysical planes within him. He shrieks in pain as memories flood, whirling about; his transformation flickers and falls as he finally exhausts his mind. He pants at the bottom of the crater, his eyes open but seeing nothing; if he wasn't severely mentally damaged he would be amazed at how he had survived the trip. That blast... it had so much power behind it, it warped space in and of itself as it plowed through the universe...!
The wave of destructive energy, the Family Kamehameha, flowing around him had acted as an ironic shield during the last leg of his journey: protecting him from minor interstellar debris, speeding him up enough to actually make it across the void of intergalactic space before he died of asphyxiation, and rocketing him into a planet. He had almost grown used to the constant burning around him. Almost, almost he had died so many times...
If the Kamehameha had been a little more powerful on impact and knocked him down to his far more vulnerable base form...
If the momentum hadn't carried him straight through the Earth's star and out the other side...
If at any moment he had breached the surface of the wave, and been dumped into cold space...
But against all odds, the Legendary Super Saiyan had struggled through, withstanding just enough force to make it to a relatively safe haven. As the wrecked dude gazes up at the moon and his eyes flutter, a final memory bursts to the forefront of his brain prior to spilling into his subconscious, to be locked away...
Vegeta's Junkyard Wastes: Age 739
"Broly! It's time for your enhancement capsule! GET BACK OVER HERE!"
The hiding child snorts; his father may be a brilliant scientist but he sure is a shitty parent. He peeks over the mound of scrap metal, looking at him. Serves the old bastard right for denying him his sweets!
"BROOOOLY! Do you want King Vegeta to get you?!" Okay, now this was cause for a laugh. The two year old new damn well that Vegeta had died a short while ago. Though... perhaps, Paragus didn't. After all, he had found that out on his own during an (unapproved) excursion back to civilization. Paragus had barely been in the city for more than a few hours a wee–
"THERE YOU ARE!"
Broly squawks in surprise as Paragus snatches him by the tail. His father thanks the gods that he had not decided to teach Broly how to resist that yet... the illegally modified incubator and, now, nursing capsule were amplifying his already tremendous power to an absurd degree relative to his age. Even with the pressure they were under living out in the boonies, perhaps it would have been safer for the both of them to let him mature at a normal rate, if a functionally five-year old Broly would have been like this.
"A power level of seventy thousand... but an IQ of fifty," Paragus mutters as he holds up the limp form of his enhanced mutant child. "At least he isn't having that nightmare anymore..." He thinks of all the times Broly had woken up, screaming about assassins or Kakarotto. Perhaps the infusion of exacerbated nursing fluid had hard-coded the traumatic memories into his head, and it only needed another trigger for him to go wild...
"Broly, do you remember what he almost did to you?! To US?! What he did do to the last saiyan child with your sort of potential?! We cannot live in a society under his... his... Supreme Kai almighty WHAT IS THAT?!"
He steps back, accidentally releasing the child. Broly plops onto the floor, growling as he rights himself prior to glaring at the thing which had gotten his father's attention. His eyes widen as the deadly sun hurtles towards them, energy and dust trailing in the sky ("KAKAROOOTTTOOOO!")... and everything goes black, then and now.