The Unknown Quantity (1919)Stream and Watch Online

Want to watch 'The Unknown Quantity' on your TV or mobile device at home? Tracking down a streaming service to buy, rent, download, or view the Thomas R. Mills-directed movie via subscription can be tricky, so we here at Moviefone want to take the pressure off.

Read on for a listing of streaming and cable services - including rental, purchase, and subscription options - along with the availability of 'The Unknown Quantity' on each platform when they are available. Now, before we get into the fundamentals of how you can watch 'The Unknown Quantity' right now, here are some specifics about the Vitagraph Company of America drama flick.

Released April 14th, 1919, 'The Unknown Quantity' stars Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean The NR movie has a runtime of about 50 min, and received a user score of (out of 100) on TMDb, which compiled reviews from experienced users.

You probably already know what the movie's about, but just in case... 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." .