| No. overall | No. in season | Title | Directed by | Written by | Original release date | Prod. code | U . viewers (millions) |
| 29 | 1 | "Kids Today" | Jennifer Lynch | Kristen Reidel | September 23, 2019 (2019-09-23) | 3LAY01 | 7 |
| This episode is set 5 months after the Season 2 finale. Buck regains his firefighting certification following his accident. The celebration is cut short when Buck throws up blood and it is revealed that he has blood clots from pushing himself to get back to work. Later on, Bobby tells Buck that he is no longer cleared to be back at work and Buck an |
| 30 | 2 | "Sink or Swim" | Bradley Buecker | Juan Carlos-Coto | September 30, 2019 (2019-09-30) | 3LAY02 | 7 |
| Buck and Christopher fight for survival as a catastrophic tsunami hits the Santa Monica Pier. Buck helps Christopher climb on top of the abandoned fire truck belonging to Station 136 and they begin to help survivors escape from the rushing waters. Bobby and the rest of the team also begin to search the water for survivors. Meanwhile, Athena and her |
| 31 | 3 | "The Searchers" | Chad Lowe | David Fury | October 7, 2019 (2019-10-07) | 3LAY03 | 7 |
| Buck continues to search for Christopher. Bobby, Eddie, and Lena of the 136 rescue survivors from a damaged Ferris wheel. Maddie enlists the help of a young girl who is an amateur drone pilot. Also, Athena deals with looters and is forced to amputate a firefighter's arm. Bobby, Chimney, and Hen rescue people from an apartment building, barely escap |
| 32 | 4 | "Triggers" | Joaquín Sedillo | David Fury & Christopher Monfette & Tonya Kong | October 14, 2019 (2019-10-14) | 3LAY05 | 6 |
| During a fire drill at a high-rise, Buck is on "light duty" as a fire inspector. He is upset to discover Lena has taken his spot at the firehouse. At dinner with Bobby and Athena, Buck storms off after learning that Bobby is responsible for his backbenching. With Athena's encouragement, Hen and Karen decide to expand their family. At dinner with Ch |
| 33 | 5 | "Rage" | Jann Turner | Lyndsey Beaulieu | October 21, 2019 (2019-10-21) | 3LAY06 | 6 |
| During arbitration proceedings, Buck's lawyer throws the team under the bus. Buck is determined to get his job back and fights with the lawyer when he is informed that monetary reward is the only damage recoverable. Michael, May, and Harry experience a traumatic traffic stop with a patrolling officer and his subordinate, almost leading to Harry get |
| 34 | 6 | "Monsters" | Tina Mabry | Christopher Monfette | October 28, 2019 (2019-10-28) | 3LAY07 | 6 |
| Buck's heavily litigated and liability-waived conditional return to the 118 is dampened by an icy reception, especially from Bobby and a distanced Eddie. Buck and Eddie make amends at last, after learning Eddie's anger was due to Buck not considering how the lawsuit could affect their relationship. Bobby reinstates Buck as a full member of the team |
| 35 | 7 | "Athena Begins" | Tasha Smith | Kristen Reidel | November 4, 2019 (2019-11-04) | 3LAY04 | 6 |
| Athena receives shocking news that the gun used in her former fiancé Emmett's 28-year old murder cold case was recovered. She then makes it her mission to find the person responsible, much to the dismay of Bobby and her mother, as they think that she's too close to the case. Flashbacks to 1989, reveal when Athena first became a police officer after |
| 36 | 8 | "Malfunction" | Joaquín Sedillo | Tonya Kong | November 11, 2019 (2019-11-11) | 3LAY08 | 6 |
| The first responders deal with a series of calls involving a serious accident at an ice skating rink that has severed the fingers of one man and left another man with a skate impaled in his chest, an out of control self-driving car, and a warehouse robot going rogue. Athena is suspended from the LAPD due to her actions from the previous episode. Ma |
| 37 | 9 | "Fallout" | Marcus Stokes | Juan Carlos-Coto | November 25, 2019 (2019-11-25) | 3LAY09 | 6 |
| Bobby's career and life are put in jeopardy while at a call involving hazardous radioactive waste in the back of a crashed semi truck. Buck feels responsible for Eddie's fighting habits and they have an enlightening conversation while spending time with Christopher. Meanwhile, after being cleared from the fatal car accident, as it was caused by a m |
| 38 | 10 | "Christmas Spirit" | Alonso Alvarez-Barreda | Andrew Meyers | December 2, 2019 (2019-12-02) | 3LAY10 | 6 |
| It is Christmas time and the police and first responders deal with calls that involve a runaway airport luggage trolley, a woman whose skin turns blue after self-medicating, and a mall shopper pushed over the edge. A young boy calls 911 after his mom collapses, but fears he may have ended up doing more harm than good while performing the lifesaving |
| 39 | 11 | "Seize the Day" | Sarah Boyd | Lyndsey Beaulieu | March 16, 2020 (2020-03-16) | 3LAY11 | 6 |
| The team responds to a series of calls involving an unconscious skydiving instructor dangling from an airplane, a bank mortgage representative getting run over by a tractor, and a man getting hit across the throat with a pipe. Meanwhile, Chimney receives a surprise visit from his half-brother Albert from Korea whom he has never met; Athena and Mich |
| 40 | 12 | "Fools" | David Grossman | Andrew Meyers | March 23, 2020 (2020-03-23) | 3LAY12 | 7 |
| Station 118 responds to calls involving a social influencer stunt gone wrong for the second time and a couple on a home date with the woman getting stuck in the bathroom window. Meanwhile, Athena and the LAPD investigate a woman who does not remember being shot in the back of the head. After getting injured while attempting to ride a skateboard tha |
| 41 | 13 | "Pinned" | John J. Gray | Nadia Abass-Madden & Juan Carlos Coto | March 30, 2020 (2020-03-30) | 3LAY13 | 7 |
| The team responds to calls of a woman's arm getting caught in a pin setter at a bowling alley and a man accidentally shooting himself in the chest with a nail gun. Meanwhile, Bobby and Michael take Harry on their annual camping trip, despite May's protests about Michael's health. Athena also talks to Hen about her fears regarding Michael's health. |
| 42 | 14 | "The Taking of Dispatch 9-1-1" | Marshall Tyler | Nadia Abass-Madden & Andrew Meyers | April 13, 2020 (2020-04-13) | 3LAY15 | 7 |
| One of the thugs dressed as police officers holding Maddie, Josh, and the rest of the staff at the 911 call center prisoner turns out to be Greg, the same man that assaulted Josh. Their plan is to distract the entire police force in order to steal millions of dollars' worth of paintings from a museum. After being tipped off from one of the 911 oper |
| 43 | 15 | "Eddie Begins" | Robert M. Williams, Jr. | Teleplay by : Christopher Monfette Story by : Robert M. Williams, Jr. & Christopher Monfette | April 20, 2020 (2020-04-20) | 3LAY14 | 6 |
| Stationhouse 118 responds to a situation involving a child stuck in a sewage pipe. Eddie volunteers to go down and rescue the child, but ends up putting his own life in danger and begins to experience memories from his past. In 2011, Eddie's girlfriend Shannon gives birth to their child Christopher in El Paso, Texas. Later on, their relationship be |
| 44 | 16 | "The One That Got Away" | Millicent Shelton | David Fury | April 27, 2020 (2020-04-27) | 3LAY16 | 6 |
| After treating a couple trapped in an apartment fire, Hen learns that the husband died from cardiac arrest in the hospital, prompting Hen to question her judgement in the doctors' course of treatment. Later, she saves the life of another man, who accidentally shot himself in the chest with a whipped-cream charger during a TV cooking show, by pinchi |
| 45 | 17 | "Powerless" | Kristen Reidel | Lyndsey Beaulieu & Kristen Reidel | May 4, 2020 (2020-05-04) | 3LAY17 | 6 |
| The 118 responds to a call in which a child is trapped in a runaway hot air balloon. Maddie also receives a call from a man trapped inside of a walk-in freezer due to a power outage caused by a woman who stole a tree trimmer truck. Meanwhile, Athena continues her investigation into the serial rapist. She tracks him to a storage facility, where he |
| 46 | 18 | "What's Next?" | Jennifer Lynch | Juan Carlos Coto & Kristen Reidel | May 11, 2020 (2020-05-11) | 3LAY18 | 7 |
| The 118 rush to save lives in the aftermath of a massive train derailment. Surprisingly, former 911 operator Abby is among those who were on the train and she informs Buck that she has moved on from their relationship and started a new one. The encounter with her leaves Buck in shock and Eddie with mixed feelings about her return to Buck's life. At |