During a drill using sulfur trioxide, a firefighter is injured and Roy is exposed to the toxic fumes. Dixie shows an ad to John and Roy about someone wanting to buy an old fire engine just like theirs; later, they help a man who injures his back doing stunts on his motorcycle. Dixie and Dr. Morton treat a boy with a sore throat while his mother begs for an antibiotic–but it turns out that the boy has something even more serious than either thought. The firemen help a man who has a heart attack at the station, and the Coast Guard (CG 1442) med-evacks the paramedics to rescue a man who fell off a cliff on Catalina Island.