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Unchained Reaction is the Discovery Channel series produced by Adam Savage and Jamie Hyneman of Mythbusters fame, which challenges teams to make amazing contraptions.

This is a game show where a group of people who have a passion for building, modifying, or fabricating cars get the chance to create a vehicle that can transform into a completely different machine. If the build is successful, the build crew gets a tool chest with $3,400 worth of Mac tools. Later add-ons to the prize, Monster Garage soundtrack CD, and occasionally (to some of the builders who go above and beyond) a Monster Garage jacket. If the build is a failure, host Jesse James feeds it to a shredder. James got his Discovery Channel fame by being chronicled in Motorcycle Mania and Motorcycle Mania 2. In Monster Garage, he is practically involved in every build; from design, construction (or destruction), and the Monster Challenge.

This engineering challenge started off some years ago in the UK and has now made it over to TLC. In 2001 they filmed two seasons' worth of programs with a whole series of extreme Junkyard machines being built by teams of bikers, high-tech engineers, school teachers, and even hillbillies!