Semi Final: Hot Wheels

S1 E9: In the last night before the finale, four teams compete in an unbelievable domino toppling and chain reaction tournament with a Hot Wheels theme. The teams will be given exciting custom elements to incorporate into their Rube Goldberg-style topples, but the pressure is on as one wrong move could set off a chain reaction that knocks them out of the running. The three teams whose topples come out on top will continue on to the finale.