When the Trailer's Rockin' Don't Come a Knockin'

Down to nine competitors everyone celebrates a birthday in style. The night ends with the birthday boy in his birthday suit and one person plotting the demise of an alliance. At the challenge a sudden twist in game play forces alliances to be revealed to everyone. Tempers flare as sides become clear, while two competitors become closer than ever. Will bonds that have been made be enough to keep people safe or will poor performance finally punish the weak?