| Boris Karloff | ... | Prof. Marcus Monserrat | |
| Catherine Lacey | ... | Estelle Monserrat | |
| Elizabeth Ercy | ... | Nicole | |
| Ian Ogilvy | ... | Mike Roscoe | |
| Victor Henry | ... | Alan | |
| Sally Sheridan | ... | Laura Ladd (as Dani Sheridan) | |
| Alf Joint | ... | Ron, the mechanic | |
| Meier Tzelniker | ... | The Jewish Baker | |
| Gerald Campion | ... | Customer in China Shop | |
| Susan George | ... | Audrey Woods | |
| Ivor Dean | ... | Insp. Matalon | |
| Peter Fraser | ... | Detective George | |
| Martin Terry | ... | Tobacconist | |
| Bill Barnsley | ... | Constable in Fur Store | |
| Maureen Booth | ... | Dancer (as Maureen Boothe) | |
| rest of cast listed alphabetically: | |||
| Toni Daly | ... | Vocalist (uncredited) | |
| Arnold L. Miller | ... | Taxi driver (uncredited) | |
Directed by | |||
| Michael Reeves | |||
Writing credits | ||
| Michael Reeves | (screenplay) and | |
| Tom Baker | (screenplay) | |
| John Burke | (idea) | |
Produced by | |||
| Patrick Curtis | .... | producer | |
| Arnold L. Miller | .... | executive producer | |
| Tony Tenser | .... | producer | |
| Michael Reeves | .... | producer (uncredited) | |
Original Music by | |||
| Paul Ferris | |||
Cinematography by | |||
| Stanley A. Long | (director of photography) | ||
Film Editing by | |||
| Susan Michie | |||
| David Woodward | |||
| Ralph Sheldon | (uncredited) | ||
Art Direction by | |||
| Tony Curtis | |||
Makeup Department | |||
| Geoffrey Rodway | .... | makeup artist (as Geoff Rodway) | |
Second Unit Director or Assistant Director | |||
| Keith Wilkinson | .... | assistant director | |
Art Department | |||
| Jack Palmer | .... | construction manager | |
Sound Department | |||
| Ken Osborne | .... | sound mixer | |
| Mike Payne | .... | boom operator | |
Stunts | |||
| Jack Silk | .... | stunt driver (uncredited) | |
Camera and Electrical Department | |||
| Maurice Corcoran | .... | gaffer | |
| Don Lord | .... | camera assistant | |
| John Mantell | .... | camera operator | |
| Gordon Thornton | .... | camera assistant | |
Music Department | |||
| Paul Ferris | .... | conductor | |
Other crew | |||
| Sheila Miller | .... | production secretary | |
| Doreen Soan | .... | continuity | |
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| Dead Ringers | The Frozen Dead | The Gamma People | They Came from Beyond Space | Thunderbirds |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Horror section | IMDb UK section |
Interesting British horror with sci-fi overtones (the premise concerns hypnotism, which leads to a string of murders): basically, a belated follow-up to star Boris Karloff's myriad mad scientist roles of the 30s and 40s! Still, he apparently resisted this angle of the script and worked with writer-director Reeves to give his character greater sympathy!
Both he and co-star Catherine Lacey are wonderful - but while Karloff delivers a dignified and understated performance, she tends towards hamminess (being the more overtly villainous of the two) but still emerges as equally effective. Ian Ogilvy (star of all 3 films Reeves directed!) is a brooding and mod 'monster'; throughout the course of the film, he interacts with three attractive girls (two of whom eventually end up dead!) - leading lady Elizabeth Ercy, ex-flame Susan George and pop singer Dani Sheridan.
Despite the film's low-budget - and the soft, scratched print utilized for the transfer - its hip Swinging Sixties look provides some definite eye candy (and not just girls in mini-skirts!), particularly during the hallucinatory if low-key experiment in which Ogilvy is an unwitting guinea pig. Paul Ferris' score, including a couple of tunes (though the flat audio on the DVD doesn't really do them justice!), is pretty good. The climax - involving a chase scene in which Ogilvy is pursued by a police car (and featuring Ivor Dean as a vaguely nonplussed, pipe-smoking Inspector) - is terrific, if slightly confusing for, while it's been shown that Lacey has greater control over Ogilvy, suddenly the situation is reversed somehow and Karloff deliberately wills the boy - and the two 'sorcerers' with him - to a fiery death!