Subtitle: The Thundarr the Barbarian Role-Playing Game
From the Introduction:
"The year 1994. From out of space comes a runaway planet, hurtling between the Earth and the Moon, unleashing cosmic destruction. Man's civilization is cast in ruin. Two thousand years later, Earth is reborn... A strange new world rises from the old: a world of savagery, super science, and sorcery. But one man bursts his bonds to fight for justice! With his companions Ookla the Mok and Princess Ariel, he pits his strength, his courage, and his fabulous Sunsword against the forces of evil. He is Thundarr, the Barbarian!"
Game mechanics adapted from the 1992 edition of Over the Edge (1st & 2nd Editions) (Jonathan Tweet, Robin D. Laws) by Brandon Blackmoor. Over the Edge is a great game by Atlas Games, and you should buy a copy.