A man with Neanderthal features and wearing pajamas stumbles through the Arizona desert, falls and dies. Dr. Matt Hastings (John Agar), a bright, handsome and sympathetic doctor from the small town of Desert Rock, is called to view the body. Asked to give an opinion as to cause of death, he finds himself perplexed. Surprised to learn the deceased was someone he knew – biological research scientist Eric Jacobs – Dr. Hastings suggests he be given permission to perform an autopsy to learn why the man's face is distorted beyond recognition. The sheriff refuses, judging an autopsy unnecessary as Jacobs' associate, Dr. Gerald Deemer (Leo G. Carroll), signed the death certificate and there is no indication of foul play.
The film opens with a brief scene serving as its introduction. A man is being caressed by feminine hands. The next shot includes the face of the woman, Tarantella (Tandra Quinn). A brief kiss between her and the man, ends with his lifeless body falling down. A disembodied voice asks the audience "Have you ever been kissed by a girl like this?" The narrative properly begins in a desert. A narrator (Lyle Talbot) mocks the overblown ego of humanity, a race of puny bipeds which claims to own planet Earth and every living thing on it. Yet, they are outnumbered by the insects, and the Hexapods are likely to survive longer that the humans. The narrator then claims that when men or women venture off "the well beaten path of civilization" and deal with the unknown, the price of their survival is the loss of their sanity.
Mickey raconte une histoire aux petits orphelins dont il s'occupe. Il choisit celle de Gulliver. Il se met en scène dans le rôle de Gulliver à son arrivée à Lilliput.
C'est le printemps. Les fleurs, les insectes et une famille de corbeaux dansent ensemble pour fêter l'arrivée du printemps. Après une brève tornade, les criquets, les grenouilles et les araignées se regroupent pour entamer la Danse des heures composée par Amilcare Ponchielli (cette mélodie sera utilisée aussi onze ans plus tard dans Fantasia).