A biological experiment in Florida goes awry. The result: 8-foot long land crabs which roar loudly and kill everything in sight.

A young Seminole indian boy comes of age outside the Florida Everglades by trying to enter the establishment (white man's world). He gets work as crew member on (Brian Keith's) fishing boat, hunts for alligators and has cathartic encounters with bad guys trying to bring illegal aliens into Florida on fishing boats.