Atouk(Ringo Starr) is a bullied and scrawny caveman living in "One Zillion BC - October 9th" (apparently in memory of John Lennon, Ringo Starr's friend and bandmate with The Beatles, whose birthday was October 9th). He lusts after the beautiful but shallow Lana(Barbara Bach), who is the mate of Tonda(John Matuszak), their tribe's physically imposing leader. After being banished along with his friend Lar(Dennis Quaid), Atouk falls in with a band of assorted misfits, among them the comely Tala(Shelley Long) and the elderly blind man Gog(Jack Gilford). The group has ongoing encounters with hungry dinosaurs, and rescues Lar from a "nearby ice age", where they encounter an abominable snowman. In the course of these adventures they discover drugs, fire, cooking, music, and learn how to walk fully upright. Atouk uses these advancements to lead an attack on ... Watch and find out!!!!!