After he runs into - literally - Vietnam veteran and professional boxer Leon Platt, T.C. steps into the ring in order to win a boxing prize that will save the man and his daughter from destitution. Higgins summons Magnum back from a job in Detroit to help before T.C.'s sense of guilt knocks him out for good.

Christmas Eve holds some unusual surprises when Magnum, T.C., Rick and Higgins find themselves stranded on a deserted island that the Navy uses for gunnery practice. As a Navy ship looking to do a little artillery work looms on the horizon, will the night end with peace and happiness for all?