9-1-1

Buck jumps back into the dating scene but fears he will return to his pre-Abby scoundrel-ous ways, while questioning if Maddie and Chimney are more than just friends. Emergencies involve a woman goes to great extremes on top of a freeway overpass to get the attention of her husband; A couple are involved in a car accident on their wedding day and a first date goes down the toilet.

Hen relives her evolution into the firefighter she is today as she recalls the first times she met Chimney and Athena.

The holidays are naughty and nice for the first responders, who must deal with a stampede at a toy store, a mistletoe stunt gone awry and neighbors competing in a Christmas-light showdown. Meanwhile, Bobby contemplates his future with Athena, Chimney and Buck attempt to lift Maddie's spirits and Eddie must decide if he wants to give his son what he really wants for Christmas – a visit with his mom.

Bobby meets Athena's parents for the first time and Maddie attempts to end her marriage for good, causing Doug to insinuate himself even deeper into Chimney's life. Meanwhile, a tanker carrying a tiger shark crashes on the freeway and a gas leak in a plastic surgeon's office happens mid-surgery.

Look back at how Chimney joined Station 118 and became the firefighter and paramedic he is today.