World War II: When Lions Roared (also known as Then There Were Giants) is a 1994 American war television miniseries, directed by Joseph Sargent, and starring Michael Caine, John Lithgow and Bob Hoskins as the three major Allied leaders, Joseph Stalin, Franklin D. Roosevelt and Winston Churchill respectively.

It was notable as the first video production to be produced in high-definition video for broadcast in the United States, using the Sony HDVS line of analog high-definition equipment, although it was broadcast by the NBC television network in standard NTSC resolution.