In the 1870s, two rival businessmen, Zack Thomas and Joe Jarrett, on a stagecoach heading to Galveston, Texas, must pull together to protect $100,000 from an outlaw named Matson. Once in Galveston, however, their rivalry continues, as Thomas joins up with Elya Carlson and Jarret with Maxine Richter. But Matson is still on the loose, and a scheming banker threatens both Thomas and Jarrett.

Anthropology Professor Robert Orwell Sutwell and his secretary Marianne are studying the sex habits of teenagers. The surfing teens led by Frankie and Dee Dee don't have much sex but they sing, battle the motorcycle rats and mice led by Eric Von Zipper and dance to Dick Dale and the Del Tones.

The film takes place aboard an American submarine in the Pacific during World War II. The sub's commander is ordered to stop and pick up an underwater demolition team led by Lt. Hayes, whose mission is to locate and destroy a US submarine sunken in a lagoon off Bikini Atoll before the Japanese are able to raise it and capture the advanced radar system on board.