Blackstar is an American animated science fantasy television series, produced in 1981 by Lou Scheimer and Norm Prescott for Filmation.

John Blackstar is an astronaut from Earth, stranded on the planet Sagar after his spacecraft was swept into a black hole, taking him to an ancient alien universe.

He is intelligent, and he often prefers to outsmart his opponent rather than rely on physical talent, even though his constant contact with the Starsword grants him super-human athletic abilities and near invulnerability.

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 Starsword, is able to absorb, store, and reflect any external form of energy, and is virtually indestructible.

The weapon generates an invisible "aura" that imbues Blackstar with superhuman senses, strength, endurance, reflexes, speed, agility, and almost unlimited invulnerability to harm and extreme temperatures.

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.

Among the identified locations on Sagar are: The premiere episode aired September 12, 1981, and the entire series original run lasted until December of that year.

It is also explained that Blackstar suffers partial amnesia from his crash on Sagar and had all but forgotten Leia when he started his relationship with Mara.