Starro is an enemy of the Justice League and occasionally Batman who has since been a recurring entity in Batman related media, most notably as a villain to Batman Beyond.
Starro is a starfish-like alien being known as a Star Conquerer who comes from a home-world identified as Star Planet. It attempted to conquer Earth only for the Justice League to assemble in-order to defeat the conquerer.
DC Rebirth
Starro came to be convinced by the Martian Manhunter to aid the Justice League in saving the universe from the villainous, "Omega Titans". In doing so, Starro willingly sacrificed itself to save the universe.
Following this, a genetic sample of Starro began growing into its cloned offspring via bio-fission. This sample was obtained by Batman and kept in a jar with the nickname of, "Jarro" (The Starro in a Jar). Jarro would become an ally under Batman's adoption and living testament to Starro's sacrifice.
Powers & Abilities
Size manipulation:
Telepathy:
Mind control Spores: Jarro can release spores which at his will can grow into starfish-like organisms that latch onto the faces of organisms to mind-control them.
Regeneration:
Bio-Fission: Jarro can asexually reproduce via effective cloning. Severed cells of Jarro's species are capable of regrowing themselves into new individual organisms.
Self-PropelledInterstellar-Flight:
Vacuum Adaptation:
Enhanced Lung Capacity/Oxygen Independence
Radiation Immunity
Supernatural Durability
Thermal Resistance
Appearances in Batman Related Media
Starro possessing Superman in Batman Beyond
DCAU:
Batman Beyond: Starro appears as the main-antagonist of the Batman Beyond episode, The Call. In it, we learn that Starro took control of Superman's mind and body like a parasite after having been a creature in Superman's Fortress of Solitude. Starro begins using Superman to try and destroy the futuristic Justice League Unlimited, enlisting Batman to try and, "Find the traitor" in order to distract the league and do away with Batman as-well. Batman manages to find out about Starro however and the Justice League teams up to attack it in the Fortress of Solitude only to be attacked by Starro's spawn. They ultimately defeat it by sending it back to its planet with Superman's technology in the fortress.
In the DLC Batman: Arkham Knight: A Matter of Family, Starro makes two cameos. We see that apparently Starro is a sideshow attraction in the Seagate Amusement Park where its hideous appearance and hypnotic powers are put on display. When exploring the park, posters for the, "Starfish Freak" can be seen where it possesses performers and the creature itself can be found in a tank, staring at Batgirl.
