DB Suicide Squad
On an alternate Earth, Goku stays evil. He is stopped by Tao Pie Pie.
Years later, Radditz comes to Earth. In a major battle that wipes out three major cities, a combination of heroes, Piccolo Sr. (Who was biding his time, waiting for an opportunity to regain his youth), and the Red Ribbon Army forces stop him. They learn about the bigger world, but Radditz still learns of the Dragon Balls, and sends word to Vegeta and Napp.
The Earth government works with the Red Ribbin Army to put together a team to stop them.
Can they survive the Saiyan invasion?! And if so, what happens if they meet Freeza, or Buu?
How far can Earth get, on their own power and technology? Where are the their limits?