"Star Wars: The Clone Wars" returns Friday to kick off a four-part story arc that has the clone troopers, under order of ruthless general Jedi Pong Krell, fighting to take the capital of the hostile alien planet Umbara.

"Darkness on Umbara" premieres at 7 p.m. CT Oct. 28 on Cartoon Network.

Track the entire season of "Star Wars: The Clone Wars":
R2-D2 & C-3PO are back
"Shadow Warrior"
"Prisoners"
"Water War"
Season 4 preview