The Empire Saga
The green skinned snail like race from the planet Namek. Piccolo, Kami, and Dende are all notable Namekkians. They possess the ability to regenerate lost limbs, stretch their limbs, have incredible hearing, and overall have a great control over their physiology.
Namekkians are usually quiet and philosophical. They have many members of their race that are warriors, but few of these are exceptional on a galactic scale.
They are also the race that is responsible for creating the Dragonballs.