“A Snake In The Grass” – The Challenge is set during the fifth episode of SURVIVOR, Wednesday, Oct. 21 (8:00-9:00 PM, ET/PT). The new season in Cambodia, themed “Second Chance,” features 20 castaways from past editions who were voted for by fans to have another shot at being named “Sole Survivor.” Photo: Monty Brinton/CBS ©2015 CBS Broadcasting, Inc. All Rights Reserved.