9-1-1 | Season 9

"Eat the Rich"

The team at 118 dedicate the firehouse in honor of Bobby’s sacrifice. Athena tries to navigate life without Bobby by distracting herself with work which begins to affect her children when it is revealed that she missed certain details like Harry dropping out of high school. Buck feels jealous over Eddie and Hen's new partnership at work. Amidst controversy, Tripp Hauser, CEO of the tech and space company Techtonyx, is called to an online meeting while kayaking, but gets trapped in the mouth of a whale. The 118 saves Tripp and Hen resuscitates him. In gratitude, Tripp offers Hen to go on a space mission with one other person, in exchange for $5 million to fund the firehouse. Karen refuses as her company is in a lawsuit against Tripp, and after several attempts by the other 118 members, Hen decides to bring Athena along. Emergencies featured include an antifreeze leak on a bus and a reclusive woman seemingly dying after a bacterial infection.

"Spiraling"

Athena joins Hen on the Macronova Inara II space mission, which Tripp has also invited his girlfriend Tricia, solar panel company CEO Parker, and football coach and former Apollo 18 astronaut Lewis aboard. Tripp is informed that a radiation flare is forming, which has a 43.7% chance of causing a geomagnetic storm, but Tripp goes through with the mission anyway. The geomagnetic storm occurs shortly after the pod reaches orbit, with the team narrowly avoiding spinning out of orbit thanks to Parker rebooting the system. Karen talks with her coworker in order to establish contact with the capsule. The 118 are called on tactical duty, with Harry accompanying them as they deal with a man stuck in a malfunctioning self-driving car and an out-of-control medical robot. All the while, the storm causes Tripp's satellites to collide with each other and become meteors heading towards LA. Karen manages to link Tripp up with the capsule, who gives them instructions on how to get back to Earth. However, as they are approaching, a fire breaks out.

"The Sky Is Falling"

Athena and Hen extinguish the fire by venting the oxygen out into space after all of them put on spacesuits, but they lose their emergency hatch. Meanwhile, Maddie, Karen and their colleagues are trying to figure out to make contact to the Inara II crew. Tripp abandons the crew and says in a press conference that everyone aboard died in order to cover up his fault. The 118 team rescues all the passengers from a stuck underground train caused by a meteor, except for a man named Cal's wife Lori, whose right leg is stuck under concrete. The rescue mission worsens when water gushes from a broken pipe, flooding the train where Lori is trapped. Karen and her colleagues eventually re-establish contact with the Inara II crew, with help from Nashville Emergency Services and assist them in reaching the International Space Station. Lewis manages to successfully navigate the craft over to the ISS. Meanwhile, May begins to help people injured from the geomagnetic storm at the firehouse. After getting Cal's permission, Chimney is forced to amputate Lori's leg and sends her to the hospital. Onboard the ISS, Hen helps an unconscious astronaut aboard who informs her that the ISS has been struck three times by debris. However, the ISS gets struck by a fourth debris field shortly after.

"Reentry"

In order to get back to Earth, the team needs to free the Soyuz escape capsule on the ISS, which can only be done by fixing a robot arm. Hen initially volunteers, but Athena chooses to go, believing she has nothing left to live for. As she fixes the arm, Athena recalls a day in her past when her and her mentor stopped a bank robbery at the cost of her mentor's life. Athena nearly dies after her regulator is damaged but after a talk with her past self she is saved by Hen. As the Inara II crew and the injured astronaut get aboard the Soyuz, Lewis stays behind in order to operate the robotic arm and make sure everyone escapes safely. Everyone makes it back safely on Earth, where Tricia leaves Tripp for Parker, who she bonded with while on the ISS. Lewis is revealed to have survived and teaches his football team from space. Hen and Athena reunite with their families, with Harry telling his mother he wants to join the 118 as a firefighter.

"Día de los Muertos"

A man wearing a headless horseman costume accidentally crashes his car into a man with a scarecrow on Halloween. The 118 accidentally mistake the scarecrow for the person the driver hit, while the man gains walking dead syndrome and walks around believing he is dead. Eventually, the 118 are able to find the man at a funeral and successfully convince him he is not dead. Meanwhile, Buck believes that Bobby's ghost is in his house after he finds the secret ingredient (cream of tartar) to Bobby's cookies after hearing something. However, it turns out to be a man named Dwayne, who was the previous owner of the house who was evicted. After finding an AA pin in the attic, Buck drops charges against Dwayne and convinces him to stay sober. Athena catches Harry wearing Bobby's uniform and scolds him, but later reconciles. Meanwhile, Eddie has begun attending church again but is reluctant to go all-in, to his abuela's concern. Eddie later learns that his abuela has died of old age, and at a Day of the Dead celebration, he honors her, Shannon, and Bobby. Emergencies featured include a giant runaway inflatable pumpkin and an abused girl named Abigail biting a priest at an exorcism due to tetanus.

"Family History"

Chimney is confused about whom he should pick from three candidates to replace him as interim captain. Instead, Maddie convinces Chimney that he should be the official captain. The 118 team responds to a Miller family reunion where they badly tear their fingers apart after doing tug of war. Harry asks Buck to help him prepare for the CPAT and interviews so he can be accepted as a firefighter, and Buck agrees. Athena responds to and helps an overdosed daughter named Alicia, who took all the pills in the bottle because of cyberbullying. Athena further investigates the case and interviews all of the daughter’s friends. Meanwhile, the 118 is called to Luna, a medical spa, where a woman named Kelsey gets anaphylaxis and later dies due to severe allergic reaction to a contrast agent. During the emergency, Dr. Brett notices Hen’s hands are trembling when she is helping Kelsey. Later at her house, Hen suddenly becomes paralyzed and collapses to the floor for hours. Athena tracks the cyberbully’s phone and it is revealed that the cyberbully is Alicia’s own mother, Cynthia. Cynthia attempts suicide after being exposed, but is stopped by Athena. Although Harry fails his interview at first because he attacked a racist in the past in self-defense, Buck encourages Harry to talk to Chief Simpson about why he deserves a second chance. Chief Simpson approves him. The next morning, Chimney is officially inaugurated as the captain of the 118. Hen returns to Luna to undergo a CT scan.