9-1-1 (2018)

S05E09 Past Is Prologue

Bobby and the 118 spring into action when an abandoned oil well blows up, leading to a huge sinkhole in the heart of downtown LA. Meanwhile, Athena delves into a three-decade-old cold case tied to a casino heist. Buck worries that his romance with Taylor may be coming to a close, while Hen encounters a man with connections to her mother, Toni’s earlier life.