Forged in Fire - Season 4 (2017)

Four bladesmiths face a new twist in the first round when they learn they can't forge any blade in their own style, they must forge a karambit, a curved knife that resembles a claw. The smiths spring into action and uncoil their finest weapon-making skills to forge a unique blade that's fit and formed to withstand brutal testing.

In a Forged in Fire first, fans voted online to bring back four of their favorite craftsmen for a second shot at victory. In the first round of competition, the smiths must use their best forging techniques to make a signature blade using barbed wire. Who will justify their fans' loyalty and conquer the competition?

Four bladesmiths face a twist right away when they are tasked with forging a Kukri, the signature blade of Master Smith and judge, Jason Knight. Up against a ticking clock and a massive billet of steel, the competitors struggle with the unusual geometry of the Kukri.

A new group of competitors face the unknown when they are tasked with using odd shapes of mystery steel to forge a blade in their signature style. All four smiths fight to the finish amidst painful injuries and setbacks.

Four bladesmiths are welcomed to the forge with a curveball-they must utilize questionable steel from mining tools to forge a blade in their signature style. Given the option to add high carbon steel to their knives, the smiths make risky decisions.

The competitors must demonstrate edged-weapon mastery when they are tasked with turning salvaged junkyard steel into a weapon. Pressured by the ticking clock, each smith turns in a finished blade in their signature style.

Four previous competitors return to the forge for a second chance, only to find that the road to redemption is far from easy.

It's double the competitors and double the heat in this first ever team challenge. Masters compete alongside their apprentices as they are forced to take turns on the forge floor, tag-teaming and fusing their skills to forge a cleaver using the arduous jellyroll technique. And in a shocking twist, one team will fracture, leaving one unlucky bladesmith to go it alone. In the final round, the smiths must forge a deadly Congolese chopper, the Nzappa Zap, in a final attempt to be named the first Forged in Fire Master and Apprentice champions.

Four blade smiths enter the forge and are given the twisted challenge of having to forge blades from a giant elevator cable. Only two will return home to recreate the African Ngombe Ngulu, known as the executions sword.

Staying a step ahead will be the key to success as four competing bladesmiths are tasked with forging a bowie that will require a d-guard in the 2nd round. Only two will manage to make it through to the final round where they must recreate a deadly sabre called the Shamshir.

This competition isn't smooth sailing as the four bladesmiths must use steel from old nautical equipment to forge weld their signature blade, while being forced to do it using a metal inlay technique. After two turbulent rounds, two smiths propel to the final round where they have just five days to forge the Kachin Dao, a deadly headhunting sword.

With a variety of steels to choose from, the smiths are forced to create a canister Damascus billet from which they must forge a dagger. After devastating setbacks, only two enter the final round where they must recreate an ancient Roman weapon known as the Scissor.

Four bladesmiths head to a scrapyard to create their signature blade using only harvested metal and a coal forge. Challenges arise when some struggle to keep their fires burning, and ultimately two competitors are left standing. In the final round, the smiths must recreate a fearsome battle weapon, the Kampilan.

The bladesmiths find the odds stacked against them when they are forced to layer a complex Damascus pattern into their signature style blade. Broken blades and tears fall throughout two challenges and an unforgiving round of testing. In the final round, two smiths are locked in a dead heat to recreate a three-bladed African throwing knife called the Kpinga.

The smiths are tasked with turning the rusted steel of a 1971 Mercury Cougar into their signature blade in just three hours. After a grueling round of testing, only two competitors' roads lead them back to their home forge where they have just five days to create an elite military weapon known as the Yatagan.

Four of the top bladesmiths from around the globe compete in the first-ever world championship. With national pride on the line, each smith must put their blood, sweat, and fire into forging a blade in their signature style.

Four bladesmiths have a monkey wrench thrown into the competition, literally, when they are asked to forge blades in their signature style from pipe wrenches. Ultimately only two competitors' pipe dreams stay alive as they advance to the final round where they must recreate a rare axe-mace hybrid called the tabar-shishpar.

Five former champs return for a competition that involves forging their signature blades from a miniature cube in the canister damascus challenge. Later, the last two contestants must re-create the Tai Chi sword in their final fight to reign supreme.

Four brave smiths are thrown for a loop when they must forge together rusty chain mail and high quality steel to produce Knights Templar Crusader Daggers in Round 1.

Four brave competitors march into a dry moat where they must resurrect old swords and forge them into a Viking Seax, using the time-tested coal forge. With hammers in full swing and multiple obstacles in their path, the smiths exhaust every ounce of their strength to produce weapons fit to withstand any test imaginable. In the final challenge, the remaining two smiths voyage home to recreate a pair of deadly Viking War Axes in their final fight for the coveted title of Forged In Fire champion.