Brainiac later reappeared as a swarm of interlinked nanotechnological units. Its operation was to sabotage a Waynetech research facility accomplished by infecting Metallo with a computer virus and controlling him from orbit. Superman and Batman tracked Brainiac's signal to an orbital facility and attacked. Brainiac's nanoswarm body was destroyed, though he had infected the Metal Men during their previous encounter with Metallo. Brainiac proceeded to use them to acquire a prototype OMAC unit, which Bruce Wayne had developed through the use of Brainiac 13 nanotechnology. Superman and Batman destroyed the OMAC body with the aid of the Metal Men, after the Metal Men overcame Brainiac's control.