The Unknown Purple (1923)

Inventor Peter Marchmont has discovered a purple light that renders the user invisible. On his release from prison, Marchmont, disguised as Victor Cromport, uses the light to revenge ... See full summary »


Roland West


Alfred A. Cohn (titles), Paul Schofield (adaptation) | 1 more credit »




Cast overview:
Henry B. Walthall ... Peter Marchmont / Victor Cromport
Alice Lake ... Jewel Marchmont
Stuart Holmes ... James Dawson
Helen Ferguson ... Ruth Marsh
Frankie Lee Frankie Lee ... Bobbie
Ethel Grey Terry ... Mrs. Freddie Goodlittle
James Morrison ... Leslie Bradbury
Johnny Arthur ... Freddie Goodlittle
Richard Wayne Richard Wayne ... George Allison
Brinsley Shaw ... Hawkins
Mike Donlin ... Burton


Inventor Peter Marchmont has discovered a purple light that renders the user invisible. On his release from prison, Marchmont, disguised as Victor Cromport, uses the light to revenge himself against his former wife, Jewel, and her partner, James Dawson, who framed him for theft. Making himself invisible, Marchmont gradually ruins Dawson. He so wins Jewel's confidence and love that she is willing to kill Dawson at Marchmont's request. Finally, Marchmont leaves the scheming couple to their own misery and marries Jewel's sister, Ruth Marsh. Written by Pamela Short

Plot Summary | Add Synopsis


Gripping! Thrilling! Unusual!









Release Date:

October 1923 (USA) See more »

Also Known As:

Mulher, Por quê Me Traíste? See more »

Company Credits

Production Co:

Carlos Productions See more »
Show more on IMDbPro »

Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
See full technical specs »

Did You Know?


The original Broadway production of "The Unknown Purple" by Roland Westand Carlyle Moore opened at the Lyric Theater on September 14, 1918 and ran for 273 performances. See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

A fading violet

'The Unknown Purple' is a VERY odd science-fiction film, with plot elements resembling 'The Count of Monte Cristo', 'He Who Gets Slapped', 'The Invisible Man', Tod Browning's 'Devil Doll' and Jack London's 'The Shadow and the Flash'. I screened a nitrate print of this film, in which all the frames in the invisibility sequences had been (partially or completely) stained purple ... but the stain had long since darkened the film stock, rendering the action on screen invisible for quite the wrong reason. Also, the original English-language intertitles had been cut out, and French translations spliced in. The action keeps jumping backward and forward in time, very confusingly: some scenes take place BEFORE scenes which have preceded them, and other scenes take place DURING previous scenes. I can't tell if this is actually part of the film's structure, or if the sequences were put in the wrong order when the French titles were added.

According to the opening credits, 'The Unknown Purple' is based on a stage play. I'd like to know how the invisibility scenes were handled onstage.

Henry B. Walthall plays Marchmont, an impoverished inventor who has somehow captured ultra-violet rays and converted them into crystals. When he holds one of these crystals in his hand and presses it with his thumb, he (and all his clothes) can turn invisible. Unfortunately, the invisibility effect emits a cone of purple light. So, Marchmont can turn invisible any time he likes, but wherever he goes he'll attract attention with his purple glow.

Marchmont's wife and his business partner Dawson betray him. When Burton (yet another inventor) creates a gizmo that is sure to be a commercial success, Dawson and Mrs Marchmont murder him and steal his gizmo, then live off the profits while they frame Marchmont for the theft and murder. Marchmont can't prove his innocence, so he serves a long prison sentence but is eventually released.

Years later, Dawson and Jewel Marchmont are wealthy. (Alice Lake, as the faithless wife, is very pretty in medium shot ... but, in close-ups -- even with the damaged film stock in this nitrate print -- we can see that her eyes are two different colours.) After Marchmont is released from prison, a mysterious burglar named the Unknown Purple suddenly strikes. Of course, it's Marchmont in disguise ... or, rather, invisible entirely. No, not quite entirely. Somehow, Marchmont is able to render himself invisible all over except for one hand, so that he can spook his ex-wife with the sight of a disembodied hand moving through a cone of purple light. The bodiless hand snatches the pearl necklace from Jewel's throat. But what good is invisibility if you keep one hand visible (clutching visible pearls) while you make your getaway?

Into the scene comes a French financier named Cromport. He looks rather different from Marchmont, but they're both obviously played by the same actor (Walthall). At first, I thought that Cromport was Marchmont in a fake beard, although Walthall (a very mannered actor) does a fine job of giving them two different personalities. When I rumbled that Cromport and Marchmont were two different people, of course it was obvious straight away that Marchmont would eventually impersonate Cromport. Sure enough...

I shan't rate this film, as the print which I viewed was in such bad condition that I feel it would be unfair of me to form any opinion. But what I saw here was intriguing enough to make me want to view a better print. Still, some parts of this story don't seem to make any sense.

6 of 11 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See one user review »

Contribute to This Page

Free Movies and TV Shows You Can Watch Now

On IMDb TV, you can catch Hollywood hits and popular TV series at no cost. Select any poster below to play the movie, totally free!

Browse free movies and TV series

Recently Viewed