TRIBES ARE TURNED UPSIDE-DOWN WHEN THEY ARRIVE TO THEIR CAMP AND ARE SURPRISED WITH A GAME-CHANGING TWIST - THEY MUST SHARE ONE BEACH, ON THE SEASON PREMIERE OF "SURVIVOR: ONE WORLD," WEDNESDAY, FEB. 15

Editor's note: The end time for the episode has been changed.

"Two Tribes, One Camp, No Rules" - It's a battle of the sexes when tribes are separated into men versus women, but they are in dismay when they learn of a game-changing twist - they must share one beach. Meanwhile, castaways are shocked when a tribe's true colors are revealed at a competitive immunity challenge, on SURVIVOR: ONE WORLD, Wednesday, Feb. 15 (8:00-9:00:15 PM, ET/PT) on the CBS Television Network.

CASTAWAYS:

Castaways competing on SURVIVOR: ONE WORLD (in alphabetical order by tribe):

SALANI: MANONO:

Nina Acosta Jay Byars

Christina Cha Colton Cumbie

Monica Culpepper Michael Jefferson

Kat Edorsson Leif Manson

Chelsea Meissner Jonas Otsuji

Kourtney Moon Bill Posley

Alicia Rosa Matt Quinlan

Kim Spradlin Troy Robertson

Sabrina Thompson Greg Smith

SURVIVOR: ONE WORLD 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: ONE WORLD and the castaways, log on to www.cbs.com/survivor.