Carnage of Krell (Season 4 Episode 10)

In this episode, the Clones find out that Krell was using them and that he was helping the Umbarans because he wanted to join the Seperatists and become Dooku's apprentice. Before he was captured, Krell caused the clones to shoot and kill one another and when the Clones got to relieve Krell of duty, he attacks them and kills a ton of them. The Clone Dogma didnt want to kill the General until he found out that he was just using him so when they were going to kill Krell and instead of Rex shooting him, Dogma did using Fives gun.