This short documentary about cheap Turkish pop movies of the 1960s-80s is required viewing if you get the DVD featuring "Tarkan and the Blood of the Vikings" and "The Deathless Devil". It's the special feature and it explains the context for these two god-awful but highly entertaining films.
The story of these grade-z films from Turkey is given through the use of narration, film clips and interviews with actors of this bygone age. It gives a lot of information, though it is by no means thorough or chronological. It's more a film made for fans--not film scholars, though I wonder if most film scholars would admit to enjoying these sort of silly escapist films.
By the way, I was very surprised to see so much nudity in these films considering they were made in a Muslim nation and so long ago. Be forewarned--there is ample boobage in this documentary, so you might want to think twice about seeing it or showing it to your mother-in-law!