Plan Double Zero was the terminology utilized by Clone Force 99 as a coded command, indicating a directive to cease all radio communications. In the initial stages of the Imperial Era, during a failed heist on the planet of Serenno, Hunter, the squad's commanding officer, reached out to the rest of the squad – specifically Echo, Tech, and Omega. Fully aware that Imperial clone troopers were actively eavesdropping on their communication channels, Hunter instructed them to initiate Plan Double Zero. Omega, however, was not acquainted with the phrase's significance until Tech provided clarification.