Avalon

Owen the Hero, Keiran the Thief, Merlin the Sorcerer and Clothilde the Bombshell go on a quest to the island of Avalon, hoping to find a magic sword there, plus the body of King Arthur, and also Edwin, the lost lover of Clothilde. First they encounter Morgana and her mischievous circle of witches, though...

Must be seen to be believed. The incredibly cheap movie was probably filmed in somebody's backyard, a few drapes suffice to suggest a "palace", a bunch of zombies appears just for fun, and the producers didn't even rent a boat to let the protagonists sail to Avalon - they have to swim. It's a bit like Ed Wood meeting Luigi Cozzi's infamous 'Hercules' movies, including the laser rays. Most viewers will think it's a waste of time, but among trash fans with a special sense of humour, some may actually have a lot of fun with it.