The Bell System Science Series

Our Mr. Sun examines the Sun and how it works, the Sun's profound influence on life on Earth, and the possibilities for harnessing sunlight for solar electricity; solar cells had been demonstrated at Bell Laboratories in 1954 during the development of the film. For the screenplay, Capra first contracted for treatments by two prominent authors, Aldous Huxley and Willy Ley. Ultimately, Capra wrote the screenplay himself, subject to approval by a scientific advisory board put together by N. W. Ayer. The principal scientific source used for the screenplay was the book Our Sun (1949) by Donald Menzel, who also consulted with Capra about the screenplay. Menzel opposed most of the religious elements of Capra's screenplay, but many were included in the version that was produced.

Hemo the Magnificent is an examination of what the circulatory system is and how it works. It was written and directed by Frank Capra, and starred Frank C. Baxter as Dr. Research, Richard Carlson as the Fiction Writer, Mel Blanc as the squirrel, June Foray as the deer, and Marvin Miller as Hemo. This film was first broadcast on March 20, 1957 at 9 PM. This was a better hour for a family program than used for Our Mr. Sun, and the program had more viewers than those being broadcast on the two other major television networks

The Strange Case of the Cosmic Rays is an examination of what cosmic rays are and how they work. It was written by Capra with Jonathan Latimer, a crime fiction novelist and screenwriter. As Gilbert describes it, the third and fourth films "repeated the formulas of his earlier work while ever searching for new contrivances for popularization as well as the best language to express his soft religious message" and that the script was essentially a reworking of ideas Capra had developed for a possible documentary about Robert A. Millikan.