Wow, you've made it this far. To avoid copy write laws things are a little different, so here's your guide. Sorry about the names, I have no idea how to spell them, so I'm guessing by phonetics. (There weren't any credits.)
Plotline
Basically some random bad guys show up out of nowhere and forces everyone to give back up their dragon balls (or rather dragon pearls?). After annihilating and taking over a village, the villain pursues the next target: Monkeyboy's (Gokuu) grandfather. While Monkeyboy goes off to fetch food trouble brews at home when Monkeyboy's grandpa is attacked. After meeting Ceeto (Bulma) Monkeyboy soon returns home to find his house in ruins and his grandfather missing and the journey begins. The name of the villain group was never disclosed as well as their purpose for finding the dragon balls or their background history.