9-1-1 - Season 4 (2021)

Athena investigates a mysterious murder during a neighborhood block party. The 118 rush to save lives endangered by a bomb threat. Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.

The 118 race to save the lives of workers trapped in a five-alarm factory fire. Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.

The 118 believes their fabled firehouse superstition has come true when they have the day from hell with a never-ending series of bizarre emergency calls.

The 118 rush to save a man pinned under a Humvee, and a garage band that rocks out too hard. Michael turns amateur detective after noticing strange behavior at a nearby apartment. Buck's re-entry into the dating pool ends in disaster.

The 118 are called to the tarmac when a flight attendant reaches her limit with her flight's passengers. Athena discovers that quarantine has pushed a couple to their breaking point. Buck reconnects with an old flame.

Athena and the 118 race to save lives after a drunk driver causes a deadly pile-up on the freeway. Maddie goes into labor. Hen and Karen are devastated as they prepare for Nia to be reunited with her birth mother.

The 118 responds to a series of calls dealing with parents and their children. Chimney and Maddie adjust to life with their newborn. Hen and Karen are emotionally shattered as Nia is reunited with her birth mother.

The 118 rush to the site of a hit-and-run that leaves a familiar face in critical condition. Athena investigates the case of a missing woman last seen in a casino. Josh recalls an emergency that led him to become a 9-1-1 operator.

When a famous mystery writer dies, Athena, Bobby and the 118 respond to the chaos caused by a city-wide manhunt for buried treasure the author left behind.

The members of the 118 make calls to save a bridezilla at a disastrous wedding and a mother trapped on her balcony. Hen plays medical detective when her mother falls ill. Athena uncovers a secret Bobby has been hiding.

In the aftermath of the shooting, Athena and the 118 are on high alert when a sniper is targeting members of the LAFD. Meanwhile, Maddie makes a life decision.