When Lt. John Harkness is assigned as the new skipper of a submarine chaser equipped with an experimental steam engine, he hopes that the U.S.S. Teakettle's veterans will afford him enough help to accomplish the ship's goals. Unfortunately, he finds the crew and its officers share his novice status or only have experience in diesel engines.

In 1932, a cop is killed and Frank Wiecek sentenced to life. Eleven years later, a newspaper ad by Frank's mother leads Chicago reporter P.J. O'Neal to look into the case. For some time, O'Neal continues to believe Frank guilty. But when he starts to change his mind, he meets increased resistance from authorities unwilling to be proved wrong.

The new commander of a Navy Underwater Demolition Team--nicknamed "Frogmen"--must earn the respect of the men in his unit, who are still grieving over the death of their former commander and resentful of the new one.

June never leaves her apartment, which has a view of an advertising sign of a knight in shining armor. She is two weeks behind in her rent and believes that if she leaves the apartment, the landlord will never let her back in. The only way she gets food is when her friend, singer Earlayne Schools, brings it to her. One evening June sees Hal, a tap-dancing sign painter, painting over her knight. She explains her predicament, and he does his best to help her out.

The swamp folk of the deep Okefenokee live a brutal primitive life untouched by modern times - they support themselves by hunting alligators and selling them to the outside world. Jeff returns home from college with an engineering degree and dreams of bringing modern medical care and education to the swamps. He is immediately confronted by his old boyhood rival, "Gator-Bait" Blair, who thinks things are just fine the way the are. "Gator" whips the ignorant locals into a frenzy of fear and resistance. When Jeff is unintimidated by their threats, Blair sets out to stop his plans once and for all - with a rifle.

An ex-con trying to go straight must face a crazed criminal out for revenge.