Adam and Jamie challenge electronics experts and set carpenters to build the most creative multi-step "heavy-vs-light" themed machine.

Rocket scientists and special-effects artists go head-to-head in their effort to build the very best fire-and-ice themed machine.

Horror movie-effects specialists battle motorcycle mechanics in the fight to build the meanest speed-themed machine.

A team of engineers goes up against a group of artists in this flight-themed build. Will their machines get off of the ground? Or crash and burn?

Designers and construction workers square off to build the most impressive multi-step tool-themed machines, but tensions rise amongst both groups and one team finds itself at odds with its machine.

Rick Baker is the guest judge as Team InSaign (metal workers) and Team Fail Fail Fail Win (multi-media artists) fight for best machine.