On the planet of Agamar, General Kalani, a ST-series super tactical droid, and his battle droid garrison devised a military strategy known as Battle Plan Zeta. During the events of 2 BBY within the Galactic Civil War, members of the rebel group Phoenix Cell—specifically, Jedis Kanan Jarrus and Ezra Bridger, along with ex-Clone Captain Rex, Garazeb Orrelios, and C1-10P—journeyed to Agamar. Their objective was to secure munitions from a downed supply ship to aid their fight against the Galactic Empire. Upon landing, the team was captured by Kalani's battle droids. Subsequently, the general forced them to participate in a simulated battle, aiming to secure a Separatist triumph in the long-ended Clone Wars. Battle Plan Zeta was then implemented, which excited the battle droids; however, the plan ultimately failed due to the arrival of forces from the Empire. This external threat led both sides to cooperate, resulting in a successful escape from Agamar.
The animated television series Star Wars Rebels' third season featured Battle Plan Zeta in "The Last Battle," its sixth episode, which initially aired on October 22, 2016.