During a practice drill designed to teach the emergency squad various methods of handle chemical spills, a fireman falls into a trench filled with deadly sulfur trioxide. Elsewhere, a woman tries to force Dr. Morton (Ron Pinkard) to violate his ethics involving presciption drugs, a man has a heart attack on the way to the station, and a hiker requires an air rescue when he is stranded on a Catalina Island cliff. And in a lighter moment, John (Randolph Mantooth) and Roy (Kevin Tighe) think they've found a buyer for their 1932-vintage fire engine. ~ Hal Erickson, Rovi