Mortoseth is known as the shadow planet. The planet itself does not rotate, so there is no night and day. There is just a dark side and a light side of the world. The dark side is barren and devoid of all life. Temperatures are in the extremes of low and the land is nothing but a barren and frozen wasteland. The light side of the planet is warm and flourishing with life. Mortoseth's light side is infamous for its large mushroom cap forests and yellow water seas.

The native inhabitants of Mortoseth are the Vagril. They are a race of short crab-like people that have a symbiosis with a mushroom that they wear on their back like a turtle shell. They once had a peaceful existence living in their forests until the saiyans arrived. Now the saiyans have taken over the world and enslaved the Vagril people. Saiyans often use them for their fungi, harvesting it straight off their backs and using it for various things. Eating it is said to make one stronger.

• Mushroom Farm