'The Last of Us' recap: Some family time before the pandemic, trauma

Joel and Tess's hunt for a car battery puts them in the orbit of the Fireflies. Joel needs a car battery because he received a signal for help from his brother Tommy, who may be in Wyoming. This plot point, new for the show, gives Joel an initial motivation to leave Boston. Robert tries to fails to scam the Fireflies with the same car battery from before (which turns out to be broken) and he's killed for it. The Fireflies needed that car battery for their journey out of Boston.