Hammer is of course best known for its Dracula movies, starring Christopher Lee as Count Dracula and Peter Cushing as his nemesis, Van Helsing. Hammer milked these for all they were worth during the 60s, but come the 70s, it was getting harder and harder to squeeze new stories out of the old reliables. At the end, Hammer was resorting to the likes of Legend of the 7 Golden Vampires, which married Dracula and Van Helsing with kung fu movies:
So Hammer looked to other ways of expanding their vampire franchises. Captain Kronos Vampire Hunter was their most famous effort and most experimental. Written and directed by Avengers stalwart Brian Clemens (the movie was produced by Albert Fennell and the music written by Laurie Johnson, too), this subverted the traditional Hammer story away from the vampire towards the vampire hunter, Captain Kronos, a pot-smoking hedonist and swordfighter, who's helped by a hunchback and gypsy woman in the movie.
As I said - experimental.
Unfortunately, patchy distribution meant that the intended sequels never emerged, but there have since been novelisations and even a comic picking up the Kronos story. And here it is in glorious HD for you. Enjoy!