This under-appreciated British anthology series, is, as many other posters have noted, a highly effective, beautifully produced and flashily photographed supernatural program of the first water.
Produced by Hammer in association with Twentieth Century Fox, it features a bevy of well known American names in addition to solid British supporting characters.
Though the series is not confined to London in setting, the overall look and feel of the program is very much Carnaby Street mod. Thus, we see a profusion of strobe lit discotheques, and mini-skirted Judy Geeson type girls, (though Miss Geeson herself doesn't appear).
The real distinguishing characteristic of the show, however, is in the extremely daring, provocative story lines, with dialog and situations that amaze, given that these were shot prior to 1970, (some programs do exceed the boundaries of propriety--were the censors off duty?).
Notwithstanding, these shows not only chill they often disturb--such as the Robert Reed program, the finale of which is genuinely unsettling, not to mention the terrifying, "Matakitas is Coming," in which Vera Miles is trapped in the public library with the ghost of a homicidal maniac.
These are definitely not for the children! Performances are also of the first rank, and we would single out Mr. David Hedison who delivers a very layered and complex performance in the episode concerning a disastrous, (literally) sense of premonition. Episodes featuring Carol Lynley as a department store mannequin, Chad Everett as a house party guest, and Patty Duke as a nervous breakdown patient also merit honorable mention.
The opening sequence in a deserted amusement park beautifully conveys the dislocated mood the series seeks to convey. Seek this one out!