DragonBall follows the adventure of Goku, as a child. Even as a child, Goku is an impossible fighter to beat.
He is on an adventure with Bulma to collect 7 wish orbs, called Dragonballs. In this series, most of the characters are introduced. Usually as villains to start out, but Goku eventually wins them over as friends.
Then DragonBall Z is the same characters, but all grown up. The main villain in Z is a planet broker named Frieza, who sells planets after he has wiped all the life off, to whomever buys them.
It looks like they’re available on Hulu.