The Clone Wars – S3E19 : Counterattack

With freed prisoners in their possession and the brutal warden attempting desperately to thwart them, Obi-Wan and Anakin search for a way out of the Citadel and back to Coruscant. The prison, however, has more traps, perils, and pitfalls in store for them than they had imagined and they must work past their differences if they are to escape. Their bid to board their shuttle fails when heavy weapons fire destroys the escape craft. ARC trooper Echo dies in the blast. The escapees then flee to the caves and call for rescue from the Jedi Temple on Coruscant.