- Country: USA
- Genres: Mystery, Thriller
- Release: 1929-09-14
- Director: Lionel Barrymore (1878–1954)
- Writers: Ben Hecht , Edwin Justus Mayer , Dorothy Farnum
- Language: English
- Stars: Ernest Torrence , Roland Young , Dorothy Sebastian , Natalie Moorhead , Sydney Jarvis , Polly Moran , George Cooper , Sôjin Kamiyama , Claude Fleming , Clarence Geldart
- Runtime: 94 min
- Awards: N/A
- AKA: El espectro verde (Venezuela) , El espectro verde (Spain) , The Green Ghost (United Kingdom) , Lo spettro verde (Italy) , The Unholy Night , O Fantasma Verde (Brazil) , Regiment of Doom (United States of America) , The Unholy Night (United States of America) , Le spectre vert (France, French Republic)
- Plot: On a dark foggy London night, someone tries to strangle Lord Montague, but he escapes. Only to discover the four other men who did get killed were old regimental comrades in Gallipoli. When Scotland Yard gets Monty to gather the other nine surviving officers at his home, one of them is murdered, and no one else has entered the house. Now, they must determine who the murderer is.
- IMDB:tt0020534
The Unholy Night Cast · · · ALL
Lionel Barrymore
(1878–1954)
Director
Ernest Torrence
Dr. Ballou
Roland Young
Lord Montague
Dorothy Sebastian
Lady Efra
Natalie Moorhead
Lady Vi
Sydney Jarvis
The Butler
Polly Moran
Polly, Maid
George Cooper
Frey, Lord Montague's Orderly
Claude Fleming
Sir James Rumsey
Clarence Geldart
Inspector Lewis
John Miljan
Major Mallory
Richard Tucker
Colonel Davidson
John Loder
(1898–1988)
Captain Dorchester
Philip Strange
Lieutenant Williams
John Roche
Lieutenant Savor
Lionel Belmore
Major Endicott
Gerald Barry
Captain Bradley
Richard Travers
Major McDougal
Ellinor Vanderveer
Guest at First Seance
Boris Karloff
Abdul Mohammed Bey - the Hindu Lawyer (uncredited)