Roy and John finally get their old fire engine restored to ride in the California Firefighters Parade. The paramedics try to stop a man from driving with heart problems and cause an accident which kills him; the woman he hit blames herself for his death. Dixie and Dr. Early assists a man having a seizure resulting from hypertension in the ER, while Roy and John help a man having trouble breathing while on a date; he accidentally drank a Mickey meant for his date. Two divorced parents fight over their child's medical condition; this leads Dr. Brackett to seek help from them. Dixie takes care of the child's wrist. En route to the parade, John and Roy notice a fire and are the first responders, in the old fire engine.

John's high school classmate is assigned as Squad 51's new trainee, and Dixie escorts John to him. The firefighters rescue a man trapped in his kitchen by a hydrogen sulfide explosion. An accident near Rampart brings three victims into the ER; with limited capacity, the paramedics jump in to help, and the trainee's inexperience shows. A child has an injured nose at an amusement park go-kart track; later at the same park, a man having a heart attack is trapped on the Sky Ride. Later, a man thought to be intoxicated was actually bitten by a cobra; Roy is subsequently sprayed in the eyes with the cobra's venom and temporarily blinded.