The city is buzzing with the annual festival, but when a live wire electrocutes a young man and causes a citywide blackout, Mina and Otis fight for his life. Meanwhile a dangerous mudslide leaves a young pregnant couple in peril and the doctors scrambling to save them both.

When a scuba diving trip goes wrong, Ryan, Ben, Tommy and Mina race to save their patient underwater, while a flame from Zee's past returns to the clinic for an unconventional treatment.