Crossover: Brainiac turns to the Justice League, the Suicide Squad and the Titans to help him oppose a cosmic-level threat in the aftermath of Dark Nights: Metal!
Brainiac Reading Order, 1958-Present: Vril Dox of Earth-One
Comics Chronology: The intergalactic collector of cities, the alien android Brainiac's fate would be tied to Superman when he stole the city of Kandor from Krypton
The HIVE (1980-1981) Reading Order
Related Events / Crossover: The rise of a new criminal organisation hits the Superman Family and leads to the formation of the new Teen Titans
Y2K (2000) Reading Order
Crossover: Brainiac turns Metropolis into a true City of Tomorrow and all it costs is freedom of thought!