Plan Double Zero was a code phrase used by Clone Force 99, signifying an order to go radio silent. During an attempted heist on the planet Serenno in the early Imperial Era, team leader Hunter contacted the other half of the squad, Echo, Tech, and Omega, and ordered them to execute Plan Double Zero, knowing Imperial clone troopers would be monitoring comm channels. Omega was unfamiliar with the meaning of the phrase until Tech explained it to her.