TENSIONS ARE HIGH AND ONE CASTAWAY REVEALS A POTENTIALLY GAME-CHANGING SECRET, ON "SURVIVOR: SOUTH PACIFIC," WEDNESDAY, OCT. 19

CHEAT TWEET: Feeling betrayed, a castaway reveals an important secret 2 his tribe. Good decision or bad? #Survivor Oct.19 @ 8pmET/PT http://bit.ly/nk0GG4

"Free Agent" - Feeling betrayed by their tribe, one castaway reveals a potentially game-changing secret, and appalled by the lack of loyalty within his tribe, another castaway threatens to leave the game. Meanwhile, on Redemption Island, Christine battles Elyse to try and win her fourth duel in a row and stay alive in the game, on SURVIVOR: SOUTH PACIFIC, Wednesday, Oct. 19 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

CASTAWAYS:

Castaways competing on SURVIVOR: SOUTH PACIFIC (in alphabetical order by tribe):

SAVAII:

UPOLU:

Mark Caruso (2nd voted off)

Sophie Clarke

John Cochran

Albert Destrade

Whitney Duncan

Brandon Hantz

Ozzy Lusth

Edna Ma

Dawn Meehan

Christine Shields Markoski (on Redemption Island)

Jim Rice

Rick Nelson

Semhar Tadesse (1st voted off)

Stacey Powell (3rd voted off)

Keith Tollefson

Benjamin "Coach" Wade

Elyse Umemoto (on Redemption Island)

Mikayla Wingle

SURVIVOR: SOUTH PACIFIC is hosted by Emmy Award-winning host Jeff Probst and produced by SEG, Inc. Mark Burnett, Jeff Probst and David Burris are executive producers and Leisa Francis is co-executive producer.

For more detailed information about SURVIVOR: SOUTH PACIFIC and the castaways, log on to www.cbs.com/survivor.