Across three grueling rounds, competitors design and forge deadly edged-weapons of war. In the final round, the two remaining bladesmiths must forge one of the most iconic weapons from history; the Japanese Katana.

Four bladesmiths must forge a weapon using only reclaimed metal. With the clock winding down, two of the competitors are dramatically forced to improvise, and one almost doesn't make it through the round at all.

The bladesmiths must transform a steel "train spring" into a weapon of their choosing. Only two competitors will move on and are given just five days to forge a legendary Viking Battle Axe.

For this week's challenge the competitors create their signature blade by using the Hada technique--a traditional process that involves forging multiple layers of steel together.

The forge heats up as our four bladesmiths struggle to create a special Japanese hardening technique on their signature blades.

The forge heats up as the bladesmiths must use an age-old technique to create their signature weapons. But will their swords make the cut when the judges put them through a battery of tests?

Four bladesmiths heat, hammer and grind their way through a first round challenge where they must transform a steel ball bearing into a fully functional weapon.

The bladesmiths must forge a signature weapon using everyday steel objects like ball bearings and shovels.