The Citadel

"Adaptation is the key to survival."

- Moral

"The Citadel" is the eighteenth episode of the Star Wars: The Clone Wars television series' third season. It aired on February 18, 2011.

Official description
"With help from R2-D2 and a squad of captured battle droids, an elite team of Jedi and clone troopers led by Obi-Wan and Anakin attempt to free a captive Jedi general, Even Piell, from an impenetrable prison."