The film presents how the human body recognizes and becomes aware of its surroundings. The various information pathways to the brain such as sight, sound, smell, taste and touch are explored in a accurate but simple manner via human impression and cartoon characters!
| Actor | Role |
|---|---|
 Frank BaxterHimself (as Dr. Frank C. Baxter) | Himself (as Dr. Frank C. Baxter) |
| HHadley CantrellHimself - Princeton University Psychologist (as Professor Hadley Cantrell) | Himself - Princeton University Psychologist (as Professor Hadley Cantrell) |
 Edwin MaxBill | Bill |
| WWilder PenfieldHimself - Director: Montreal Neurological Institute (as Dr. Wilder Penfield) | Himself - Director: Montreal Neurological Institute (as Dr. Wilder Penfield) |
 Peter BrownAristotle's student (uncredited) | Aristotle's student (uncredited) |
 Karl SwensonHal - the Cameraman (uncredited) | Hal - the Cameraman (uncredited) |