Schoolteacher and family man Ed Avery, who's been suffering bouts of severe pain and even blackouts, is hospitalized with what's diagnosed as a rare inflammation of the arteries. Told by doctors that he probably has only months to live, Ed agrees to an experimental treatment: doses of the hormone cortisone. Ed makes a remarkable recovery, and returns home to his wife, Lou, and their son, Richie. He must keep taking cortisone tablets regularly to prevent a recurrence of his illness. But the "miracle" cure turns into its own nightmare as Ed starts to abuse the tablets, causing him to experience increasingly wild mood swings.

Tarzan's jungle home, and his family, Jane and Boy, are threatened by men greedy for gold.

An expedition seeking to bring Jane back to civilization, and Tarzan into captivity, gets more than it's bargained for.