A number of story elements have been said to have been influenced by 'Star Wars'. The magical flying sword was called "The Power"; the elf and dwarf characters C3PO and R2D2 equivalents whilst Voltan's outfit resembled Darth Vader's costume. Moreover, Voltan's half-helmet has also been compared with the Phantom of the Opera's mask.
Jack Palance was injured in a fight scene with John Terry when Terry's sword punctured Palance's body. Palance didn't stop and completed the take. Afterwards, director Terry Marcel went over to see if Palance was alright, the veteran actor cast any concerns aside and continued with the shoot.
Although planned as the start of a franchise amid much local publicity, the movie was released in the UK as the supporting feature to Saturn 3 (1980) before it was picked up for theatrical distribution in some territories such as North America.
In January 2009, a sequel to this movie, Hawk the Hunter (????) was announced, the sequel's scheduled release will be thirty-one years after this movie. The tagline reads: "The Slayer returns. The Hunt begins".
Bernard Bresslaw hurt his neck rather badly in the scene where a nun drugs him towards the end of the picture. As he fell down, his armour dug in underneath his jaw. Being a trooper, though, he carried right on acting.
Actor Bernard Bresslaw playing Gort was injured when in a fight scene with a stuntman, Bresslaw hurled his hammer at his opponent's torso upon which he fell but the weapon also fell upon Bresslaw's head requiring six stitches.
William Sheppard and Christopher Benjamin both have been in Doctor Who (2005). Sheppard was in the 6th Season/Series premiere as the older Canton Delaware III, and Benjamin in "The Unicorn and the Wasp" 4th season ep. as Colonel Hugh.