Myriad is a technological program created by Astra to "force everyone to her way of thinking", turning them into mindless and obedient drones that could be directly piloted by the user or given verbal commands. The signal could be broadcasted across an entire city through its computing network. The only humans immune to Myriad's affects are Maxwell Lord and Cat Grant, though some aliens where also unaffected, such as Kara Danvers, Maxima, the White Martian, and the K'hund.
History
Astra first tried to use it on Argo City, which led to her and Non's incarceration in Fort Rozz. Krypton's High Council deemed the program as too dangerous to be discovered by other worlds, or from the planet's own citizens, due to its potential to upset the balance of power in the galaxy.
Worlds Finest
At night, though unseen, this program was put into effect on every citizen of National City by Non and Indigo.
Myriad
Superman and every citizen of National City, except for Maxwell Lord and Cat Grant, are under Myriad's control.