This week on WGCU — Cable channel 3

American Masters You Must Remember This: The Warner Bros. Story

Their only bankable movie star was the four-legged hero Rin Tin Tin. But in 1923, four visionary brothers from Ohio officially incorporated their new motion picture studio, Warner Bros. Narrated by Clint Eastwood, featuring hundreds of film clips; archival interviews; and on-camera discussions.

Part 2: Good War, Uneasy Peace (1935-1950)

Wednesday, Sept. 24 at 9 p.m.

Warner Bros. becomes home to a roster of celebrated stars. The studio faces the twin catastrophes of the Depression and World War II. Warner answers with films that reflect a deep and defiant belief in the courage of common people. After the war, on-screen noir reflects the off-screen anxiety of blacklists and political witch-hunts.

Part 3: A New Reality (1950-1970)

Thursday, Sept. 25 at 9 p.m.

Television arrives. Warner Bros. fights back with new technology and new stars (girl-next-door Doris Day and teen icon James Dean). A showdown between Harry and Jack Warner leads to a daring new spirit at the studio that releases breakthrough films.

Killer Stress: A National Geographic Special

Wednesday, Sept. 24 at 8 p.m. and Sunday, Sept. 28 at midnight

Stress. It's always been there to save our lives. It's what made us run from predators and enabled us to take down prey. But today, humans are turning on that same stress response to deal with 30-year mortgages, difficult bosses, teenagers and traffic jams. Some of us are wallowing in corrosive hormones; for the first time, scientists can reveal just how measurable and dangerous that exposure can be. MacArthur "Genius Grant" recipient and Stanford University neurobiologist Robert Sapolsky and "National Geographic" search for answers to why stress seems to be killing us.