The Hazards of Helen is an American adventure film serial (or possibly a film series) of 119 twelve-minute episodes released over a span of slightly more than two years by the Kalem Company between November 7, 1914 and February 24, 1917. At 23.8 hours, it is one of the longest non-feature-length motion picture series ever filmed, and is believed to be the longest of the film serial format. Based on a novel by John Russell Corvell and the play by Denman Thompson, the series was adapted to the silent screen by W. Scott Darling.