Four bladesmiths honor the forge's legendary power hammer Big Blu by ripping it apart and forging competition choppers. But will beating beast's high carbon heart, the piston, provide enough steel for all the smiths? After two exhaustive rounds, two remaining smiths head home to recreate one of history's most unique hunting weapons: the Rock-Throwing Crossbow. Which smith will sling themselves to the title of Forged in Fire champion, earning respect and the $10,000 check?