Order 66

"Execute Order 66."

- Darth Sidious issues Order 66

Order 66, also known as Clone Protocol 66, was one of the 150 Contingency Orders of the Grand Army of the Republic which all Clone Troopers were trained to obey by way of a biochip implanted in their brains. The order mandated that the Jedi Order attempted to stage a coup against the Galactic Republic, and all Jedi were to be executed immediately. The biochips implanted within the Clone Troopers were activated when Chancellor Palpatine sent a message to execute Order 66 to all Clone Commanders across the galaxy.

Biochip overview
"Under this directive, any and all Jedi leadership must be executed for treason against the Republic."

- Commander Rex briefs his men after receiving Order 66

About the time of Stage-3 Embryos, every clone was implanted with an organic, but foreign, tumor. The genetic code in this tumor would program every clone to turn on the Jedi upon activation, but the tumor was incredibly hard to find. Certain viruses, such as one found on Ringo Vinda, could cause the chip to decay. This caused clone trooper Tup to execute his Jedi before Order 66 was issued before he himself died by the virus. Following this, ARC Trooper Fives removed his own chip to no ill effect and wanted to prove that the inhibitors had a purpose, but he was killed before he could share his findings with the Jedi.

Kaminoan scientist Nala Se covered up the investigation by claiming that the virus was what caused both Tup and Fives to go rogue and eventually die. The Jedi and the Senate both accepted these findings. Unbeknownst to them, the Kaminoans knowingly implanted this tumor in the clones under the guidance of Dooku and Darth Sidious. The chip's true purpose was to ensure absolute loyalty when Order 66 was issued, forcing the Clone Troopers to execute their Jedi leaders.

Known Victims

 * Tiplar: Killed by Tup over Ringo Vinda Premature execution
 * Ki-Adi-Mundi: Killed by Commander Bacara on Mygeeto
 * Aayla Secura: Killed by Commander Bly on Felucia
 * Plo Koon: Killed by Captain Jag over Cato Neimoidia
 * Stass Allie: Killed by Commander Neyo on Saleucami
 * Shaak Ti: Killed by Anakin Skywalker in the Jedi Temple on Coruscant
 * Cin Drallig: Killed by Anakin Skywalker on Coruscant
 * Depa Billaba: Killed by Captain Grey on Kaller

Known Survivors

 * Obi-Wan Kenobi
 * Yoda
 * Ahsoka Tano
 * Quinlan Vos
 * Coleman Kcaj
 * Oppo Rancisis
 * Caleb Dume
 * Gungi

The Clone Wars

 * "Carnage of Krell" Indirect mention only
 * "The Unknown"
 * "Conspiracy"
 * "Fugitive" Indirect mention only
 * "Orders"
 * "Voices" Appears in vision
 * "Shattered"
 * "Victory and Death"

The Bad Batch

 * "Aftermath"
 * "Cut and Run"
 * "Rampage" Indirect mention only
 * "Battle Scars"