An adventurous geology professor mounts an expedition that descends into a subterranean world of luminous rocks, antediluvian forests, and fantastic marine life -- a living past that holds the secrets to the origins of human existence.
When his colleague Long Arrow disappears, Dr. Dolittle sets off with his assistant, Tommy Stubbins, his dog, Jip, and Polynesia the parrot on an adventurous voyage over tropical seas to floating Spidermonkey Island.