| Boris Karloff | ... | Dr. Leon Kravaal | |
| Roger Pryor | ... | Dr. Tim Mason | |
| Jo Ann Sayers | ... | Nurse Judith Blair | |
| Stanley Brown | ... | Bob Adams | |
| John Dilson | ... | District Attorney John Hawthorne | |
| Hal Taliaferro | ... | Sheriff Ed Stanton | |
| Byron Foulger | ... | Dr. Henry Bassett | |
| Charles Trowbridge | ... | Dr. Harvey | |
| Ernie Adams | ... | Pete Daggett | |
| rest of cast listed alphabetically: | |||
| Bruce Bennett | ... | State Trooper (uncredited) | |
| James Conaty | ... | Doctor Spectator (uncredited) | |
| Eddie Dew | ... | Doctor Spectator Listening to Explanation (uncredited) | |
| Minta Durfee | ... | Frozen Therapy Patient (uncredited) | |
| William Marion | ... | Doctor Spectator (uncredited) | |
| Charles Miller | ... | Doctor Spectator Explaining Procedure (uncredited) | |
| Ivan Miller | ... | Sheriff Haley (uncredited) | |
| Wedgwood Nowell | ... | Doctor Spectator (uncredited) | |
| Cyril Ring | ... | Doctor Spectator (uncredited) | |
| Landers Stevens | ... | Doctor Spectator (uncredited) | |
| Lee Willard | ... | Frozen Body of Jasper Adams (uncredited) | |
Directed by | |||
| Nick Grinde | (as Nick Grindé) | ||
Writing credits | ||
| Karl Brown | (screenplay) | |
| Harold Shumate | (story) | |
Produced by | |||
| Irving Briskin | .... | producer (uncredited) | |
| Wallace MacDonald | .... | producer (uncredited) | |
Cinematography by | |||
| Benjamin H. Kline | (director of photography) (as Benjamin Kline) | ||
Film Editing by | |||
| Al Clark | |||
Art Direction by | |||
| Lionel Banks | |||
Second Unit Director or Assistant Director | |||
| Arthur S. Black Jr. | .... | assistant director (uncredited) | |
Sound Department | |||
| Edward Bernds | .... | sound engineer (uncredited) | |
Music Department | |||
| Mischa Bakaleinikoff | .... | composer: stock music (uncredited) | |
| Gerard Carbonara | .... | composer: stock music (uncredited) | |
| Ben Oakland | .... | composer: stock music (uncredited) | |
| Karol Rathaus | .... | composer: stock music (uncredited) | |
| Morris Stoloff | .... | musical director (uncredited) | |
| Gregory Stone | .... | composer: stock music (uncredited) | |
Other crew | |||
| Ralph S. Willard | .... | technical advisor (as Dr. Ralph S. Willard) | |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Mystery section | IMDb USA section |
A doctor researching "frozen therapy" seeks out Boris Karloff, the therapy's originator. Boris has been missing from his island laboratory for ten years. After ignoring requests to stay off the island by locals, the doctor and his beautiful nurse discover Boris frozen in secret caves beneath the lab. Boris has been frozen along with a host of villagers. Through flashback it is learned these others came to arrest Boris for murder ten years earlier and they all wound up being gassed and frozen. This is the proof Karloff needs to vindicate his research. He sets out to duplicate his accidental results, his methods become increasingly Machiavellian. Ultimately he is his own undoing. This movie is hard to catagorize. The film makers tried to add shock to an interesting scifi story. The film succeeds in spite of the efforts to punch it up. The acting is uneven but overall this is a top notch "B" effort. The science is very plausible, a rarity in old laboratory films. See it and be pleasantly surprised