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- Real name: Unknown
- Alias: Pulsar Stargrave
- Identity: Secret
- Alignment: Bad
- Gender: Male
- Occupation: Would-be universal conqueror
- Family: None known
- Affiliations: None known
- First appearance: Superboy & the Legion of Super-Heroes #223 (Jan 1977)
- Appearance of death: Legion of Substitute Heroes Special #1 (Apr 1985)
- Universe: Pre-Zero Hour
- Alternate versions: None
Stargrave first appeared observing a confrontation between the Time Trapper and five Legionnaires.
He then tried to convince Brainiac 5 that he was his father. He claimed that he was transformed by aliens and the power of an exploding sun. He confessed that he had once been an ordinary mortal scientist who was studying a star when his life support failed. This placed him in a drug-induced suspended animation. He was then found by aliens who teleported his 'corpse' into a nearby star at the moment of a super-nova. His mind fused with the exploding plasma and the supernova apparently collapsed into a pulsar with a living heart.
Stargrave sent Brainiac 5 to Zerox to steal Mordru's power, but once he arrived on the Sorcerors' World, he was told by the Star Stone that Stargrave was, in fact, Brainiac One - Superman's foe from the 20th Century. When Brainiac 5 heard this, he swore revenge on Stargrave and threaten to kill him.
When the planet Bismoll went to an all-computer world system, it attracted the attention of Stargrave. The only heroes Senator Tenzil Kem (formerly Matter-Eater Lad) could call upon were the Legion of Substitute Heroes. Stargrave was eventually destroyed when Stone Boy was dropped on the android's head, splitting him in two.