The 118 springs into action when a city-wide blackout and a record heatwave causes mayhem in Los Angeles. Meanwhile, Chimney confides in Hen about Maddie's condition and Athena's worst nightmare comes true.

Adela Paez, Anirudh Pisharody, Carly Nykanen, Chiquita Fuller, Claudia Christian, Daniel Kash, Gabrielle Walsh, Jeremy Cohenour, Jessica Buda, Joseph Lim Kim, Karen McClain, Kyle Louis, La Monde Byrd, Louis C. Giordano, Mary Morgan, Melanie Hawkins, Noah Bean, Sasha Roiz, Trevor Dolden