Bud plays catch with flipper, teaching him how to retrieve items from the ocean floor. An SOS comes through; Bill Darmon has been attacked by a shark and needs blood urgently. Porter contacts the Coast Guard to arrange the blood delivery before going out with Bud to rescue Bill. The helicopter arrives but during the transfer the blood is lost overboard. A number of attempts are made to retrieve it but a persistent shark stops all efforts till Flipper comes to the rescue, fights off the shark and brings the blood up.
—glen_chapman <chapman_glen@yahoo.com>