World War One is an American documentary television series that was shown on CBS during the 1964���1965 television season to commemorate the fiftieth anniversary of the start of the war. The series was produced by CBS News, which featured 26 half-hour episodes, was narrated by Robert Ryan. World War One originally aired on Tuesday nights at 8 pm Eastern Time, but at mid-season it was moved to Sunday nights at 6:30 pm because it was being beaten in the ratings by the second half-hour of ABC's Combat! and the second half-hour of NBC's Mr. Novak. Re-released in 1995, the series is available on video tape and DVD but no US video-on-demand services have it.