The two-night event will shake up the season like a snow globe with unpredictable twists and surprises as special guests NeNe Leakes, Marshawn Lynch, Kelly Osbourne and Rob Riggle pair up with fan-favorite former contestants – David Guedes (Season 3), Caleb Schilling (Season 2), Krystle Starr (Season 1) and Randall Wilson (Season 2) – to compete in ingenious holiday-themed challenges for charities of their choice.