The contestants have 30 minutes to stop explosives from detonating before the two trucks carrying them hit head-on.

The contestants face their toughest challenge yet: stop a missile with a missile. But when Dan storms out of the shop after a heated fight and the opposing team struggles to complete an improbable design, will either team complete their build?

After Joe and Joel are eliminated, the contestants now face a real-world challenge: build a personal shelter to keep a rescue worker safe from extreme wind, water, and fire. Can the teams keep their cool or will clashes over design derail both builds?

Competitors take on an Olympian challenge: design a robot that can tackle three athletic events. The threat of failure looms when one leader fails to manage his team's talents and later, a shocking elimination leaves one competitor in distress.

The competitors must harness the power of a waterfall to build an elevator. While one team works together to get their idea off the ground, the other falls apart when tensions between Gui, Amy and Dan reach an all time high. Can they put aside their diffe

A wildcard is brought back and the competitors must create an automated machine that can prepare a meal.