Unchained Reaction is a science and engineering reality game show that airs on the Discovery Channel. It is judged and executive-produced by Adam Savage and Jamie Hyneman, best known for hosting the science entertainment series MythBusters.Premiered on March 18, 2012, the series pits two teams of various backgrounds against each other to build an elaborate chain reaction contraption (sometimes also referred to as a "Rube Goldberg" machine or device).