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.

The Unchained Goddess examines what weather is and how it works. It was the fourth and last film in the series that was produced by Frank Capra, who wrote the screenplay with Jonathan Latimer. Unlike the first three of the films, this film was directed by Richard Carlson, who also appears in the film.

Gateways to the Mind is about what the five senses are and how they work. It was produced and directed by Owen Crump. The screenplay was by Henry F. Greenberg, a television screenwriter who was active in the 1950s and 60s. In addition to Dr. Baxter, it starred Wilder Penfield and Hadley Cantrell, with actor Karl Swenson playing the role of a cameraman (the program was set on a soundstage in a mock "behind-the-scenes" format). Chuck Jones directed the animation, which was designed by Maurice Noble. In 1966, Jones won an Academy Award for Best Animated Short Film for directing The Dot and the Line: A Romance in Lower Mathematics

The Alphabet Conspiracy examines language and its history. The screenplay was written by Leo Salkin and Richard Hobson. Salkin had worked for UPA (the firm that produced animations for Our Mr. Sun) both as an animator and as the writer for numerous cartoon shorts. The screenplay uses characters from Lewis Carroll's Alice in Wonderland. It was directed by Robert B. Sinclair, who had worked on numerous films and television programs. The cast included Cheryl Callaway (as Judy), Stanley Adams (as the theatrical agent), and Hans Conried (as the Mad Hatter). Daws Butler (uncredited) voiced several characters. The animated sequences were directed by Friz Freleng, who subsequently won the Academy Award for Best Animated Short Film for directing The Pink Phink

AT&T and N. W. Ayer were apparently somewhat dissatisfied with the first two Warner films, and unsuccessfully approached Capra about bidding on production of Thread of Life and About Time. Thread of Life is about heredity, DNA and how it works. The screenplay was by Rowland Barber, a writer perhaps best known for the 1960 novel The Night They Raided Minsky's. Owen Crump directed; Robert McKimson directed the animation.

About Time examines time. The screenplay was written by Richard Hobson, Nancy Pitt, and Leo Salkin. Owen Crump directed, with Phil Monroe directing the animations. The film starred Richard Deacon and Les Tremayne and featured Richard Feynman who was used as a consultant