As the competition passes the halfway point, Gary Lineker tests the mettle of the remaining celebrities in a spine-chilling individual challenge. With no one to rely on but themselves, those with the most backbone are rewarded. A mystery box returns and one team captain must decide whether to gamble for a potential advantage - but nothing is ever predictable. In the team challenge, romance is in the air - but the love is short-lived as a cruel rule change sparks tension.