The Sand Slug is a creature featured in He-Man and the Masters of the Universe.
A Sand Slug is a slimy desert creature known on the planet Eternia. The evil wizard Kothos once cast a spell to turn Evil-Lyn into a Sand Slug, but she turned it back on him, leaving him unable to cast another spell to return to normal.
Some time later, Kothors finally managed to convince Orko to use his magic and turn him back into a human.