The Suicide Squad: Everything You Need To Know About Starro
3. He's Teamed Up With The Justice League
During the Metal event, the barriers between universes, The Source Wall, cracked open, releasing four godly beings called Omega Titans. These entities travelled the universe, destroying specific worlds, which would eventually collapse the entire multiverse.
When the universe's smartest being, Brainiac, discovered the Omega Titans' plan, he realised that no single person in existence could defeat them. Out of desperation, the Coluan created a superteam which he believed stood the best possible chance of destroying the Titans.
Brainiac's group was composed of the usual suspects; Superman, Batman, Wonder Woman, etc. However, the superheroes were baffled to learn the team also consisted of supervillains such as Lex Luthor, Deathstroke, and Starro. Even though the Star Conqueror detested working with his enemies, he agreed to help Brainiac since he wouldn't be able to conquer the universe if said universe was destroyed.
Superman and his teammates have had beef with Starro for decades but they put their differences aside for the common good. The parasitic starfish proved to be a worthy member of Brainiac's team since he used his vast psychic abilities to disrupt the Omega Titans, preventing them from causing untold destruction upon reality.