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The Unknown Quantity

Where to Watch The Unknown Quantity (1919)

In the mood to watch 'The Unknown Quantity' from the comfort of your living room? Tracking down a streaming service to buy, rent, download, or view the Thomas R. Mills-directed movie via subscription can be a huge pain, so we here at Moviefone want to take the pressure off.

Below, you'll find a number of top-tier streaming and cable services - including rental, purchase, and subscription alternatives - along with the availability of 'The Unknown Quantity' on each platform when they are available. Now, before we get into all the details of how you can watch 'The Unknown Quantity' right now, here are some details about the Vitagraph Company of America drama flick.

The Unknown Quantity starring Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean has a NR rating, a runtime of about 50 min, and a scheduled release date of April 14th, 1919.

Thinking about what happens in this film? Here's the plot: "Mary Boyne, who made shirts at four dollars a week, had no place for love in her life - only despair and hate for the son of the man who had plunged her family into deepest distress. Peter Kenwitz loved Mary, but because he was a mathematician and a pessimist by trade, his love was as hopeless as her chance for happiness." .

'The Unknown Quantity' Release Dates

Watch in Movie Theaters on April 14th, 1919