A paramedic from England has a stint with Station 51 observing Roy and John whose rescues include a structure fire, a wild-west performer, a car accident and a man trapped in heavy machinery. The visitor saves John's life. At the hospital Dr Brackett treats a rock singer in a diabetic coma and Dr. Early has problems with a defiant nurse.

John and Roy think about going into the floor cleaning business on the side. A hermit is trapped in his cave home. Dr. Morton treats a famous singer. John is injured on a high rescue, and the station battles a chemical warehouse fire.

The men at the station find out that Roy picks winning racehorses and pester him to choose one for them to bet on. A lion bites a woman at the zoo, a go-go dancer collapses, a man's ego punctured by cactus, and the squad rescues a policeman shot during an exchange of gunfire with a sniper.

While responding to a call, Roy and John witness a pedestrian being struck by a car. A woman is badly burnt in a fire. John thinks about settling down. A belly dancer overdoses on diet pills. A child bites a dog and the dog bites back. At a structure fire, Roy and John must jump to safety.