VIDEO: Sneak Peek - 'Immunity Challenge' on This Week's SURVIVOR on CBS

Get an early look at the 'Immunity Challenge' featured on SURVIVOR: PHILIPPINES, Wednesday, Oct. 10 on CBS at 8pmET/PT.

Eighteen castaways will compete on SURVIVOR: PHILIPPINES when the Emmy Award-winning series returns on Wednesdays. Three of the 18 castaways are former players who were medically evacuated from the game and are returning to finish what they started. Fifteen castaways are new to the competition.

Surrounded by water, SURVIVOR: PHILIPPINES will prominently feature marine-based challenges. For the first time in eight years, castaways will be divided into three tribes named after animals in the region: Kalabaw (“Water Buffalo”), Tandang (“Rooster”) and Matsing (“Monkey”). The tribes feature individuals from different backgrounds competing for the same ultimate goal: to be Sole Survivor.