Blackstar is an American animated television series, a science fantasy story sometimes reported as being inspired by Thundarr the Barbarian.It was produced in 1981 by Lou Scheimer and Norm Prescott for Filmation.

John Blackstar is an astronaut from Earth stranded on the planet Sagar after being swept in his spacecraft through a black hole that took him to an ancient alien universe. On Sagar, John makes allies with the Trobbits, the shape-changing Klone, the dragon Warlock, and Mara the Enchantress. With his allies, Blackstar opposes the Overlord who seeks to take over Sagar.

The PowerStar and its two halves

The PowerStar was a mighty magical weapon that was split in two through unknown events, with Blackstar and the Overlord each possessing one half. Blackstar's weapon, the Star Sword, is able to absorb, store, and reflect any external form of energy, and is virtually indestructible. It can also produce blasts of pure energy capable of destroying a target. The weapon generates an invisible "aura" which imbues Blackstar with superhuman senses, strength, endurance, reflexes, speed, agility, and a limited invulnerability to harm and extreme temperatures. Presumably, the Overlord's Power Sword confers similar abilities. For a brief time in the episode "Spacewrecked," the Star Sword and the Power Sword are re-united into the PowerStar.

Blackstar's fate

In the sixth episode, "Spacewrecked", Blackstar was briefly reached by his former Earth girlfriend, Lieutenant Katana, who spent some time on Sagar before a misadventure with the Overlord forced her to leave. Katana did not appear in any other episodes, although the story ended with her asking a superior for permission to organize an armed rescue mission.