Plan 55 was a codename used by Clone Force 99. This strategy necessitated a minimum of two people performing a synchronized action in combat. In approximately 18 BBY, during their assignment on the world of Erebus to retrieve ex-Imperial Vice Admiral Edmon Rampart, the clone troopers Hunter, Wrecker, and Crosshair, the last of whom had just rejoined the team, tried to seize a HCVw A9 turbo tank. As they boarded the armored vehicle and readied themselves to access the cargo bay where Rampart was located, Crosshair questioned Wrecker about his recollection of Plan 55. Upon Wrecker's confirmation, the two clones proceeded with the tactic. Upon entering the cargo hold, Crosshair quickly neutralized three TK stormtroopers, while Wrecker dealt with the other two. Ultimately, their rescue operation achieved its intended outcome.
The strategic maneuver Plan 55 was featured in "Juggernaut," which is the twelfth installment of the third season of Star Wars: The Bad Batch. This particular episode was initially broadcast on April 10, 2024.