The wealthy Dr. William Barton (Jeff Morrow) organizes an expedition to the Florida Everglades with the scientists Dr. Thomas Morgan (Rex Reason), Dr. Borg (Maurice Manson) and Dr. Johnson (James Rawley) to capture the Creature. They navigate in the ship of Capt. Stanley (David McMahon) with Jed Grant (Gregg Palmer) and Dr. Barton’s wife Marcia Barton (Leigh Snowden) joins the team. Dr. Barton is paranoid with the jealousy of Marcia and Jed is harassing her in the trip.
They chase and capture the Creature that is totally burnt. Without breathing through the gills, the Creature is turned into an air breather through his hidden lungs and brought to the ranch of Dr. Barton in California. Dr. Morgan defends the thesis that the Creature responds to the way that he is treated and asks people to be not violent with him. But Dr. Barton is near a breakdown with his jealousy of Marcia.