Crusader Sword: The bladesmiths are tasked with utilising a Japanese hardening technique, before the two finalists forge the legendary Crusader Sword. (S1, ep 2)

Rookies Edition: Five novice smiths must earn their way into the competition before the forge is even lit, before recreating a 16th-century weapon known as the War Golok. (S5, ep 1)

Judge's Pick: For the first time, it's judge against judge when all four pick a past bladesmith to represent them in the ultimate battle for supremacy. (S4, ep 1)

Champions Edition: Season three begins with the return of four champions who are charged with making a high-carbon-steel inlay. (S3, ep 1)

The War Hammer: After dumpster diving for the best blade materials, the two finalists must forge the mightiest war hammer they can and strike the winning blow. (S2, ep 1)

Japanese Katana: Four bladesmiths compete for a $10,000 prize by forging the finest Japanese Katana blade - a weapon designed to cut as it is unsheathed. (S1, ep 1)

Saab: It's a first for the boys as they set their sights on a Saab. But when all hopes of a classic 99 are dashed, they're forced to settle for a failed rally car. (S2, ep 10)

Metro: The guys reckon there's big profit to be made when they track down a 1980s Austin Metro. It's cheap, it's clean and it's bright yellow. Can they treble their money? (S1, ep 10)

Reliant Kitten: The guys take on a major challenge when they spot an abandoned Reliant Kitten. One engineer has already given up. Are Will and Gus about to do the same? (S2, ep 9)

Mazda: Gus and Will take on a Mazda MX-5 that's been given some real boy racer attitude. Can they return it to its former glory? (S1, ep 9)