BLACKTHORNE is an action-adventure game that takes place on the planet Tuul. Tuul was a peaceful place, until the evil warrior Sarlac used the power of the Darkstone to take control. Blackthorne's father, the good King Vlaros, sent him to Earth just as his kingdom crumbled around him. Now, 20 years later, Blackthorne is grown and must return to Tuul to free it from the clutches of Sarlac.