Episode 4×05 “A.C.H.”

When a new designer drug hits LA streets, it turns users into “zombies,” and Officer Nolan and the team have a Halloween they won’t soon forget.

Back at home, Lucy questions whether her apartment building might be haunted.

Guest starring is Pete Davidson as Pete Nolan, Enver Gjokaj as Donovan and Dylan Conrique as Tamara Colins.

“A.C.H.” was written by Zoe Cheng and Paula Puryear, and directed by Dan Willis.

Air Date: Sunday, October 31 (10:00-11:00 p.m. EDT), on ABC.

Photos: “A.C.H.”

Episode 4×04 “Red Hot”

Officer Nolan and Officer Chen search for a missing person who may have international ties that puts everyone’s lives in danger.

Meanwhile, Harper continues the search for a serial arsonist after responding to a report of an injured cyclist.

Elsewhere, Wesley must overcome an impossible task.

Guest starring is Jay McLaren as Elijah, Tru Valentino as Aaron Thorsen and Jenna Dewan as Bailey.

“Red Hot” was written by Diana Mendez and directed by Lisa Demaine. 

Air Date: Sunday, Oct. 17 (10:00-11:00 p.m. EDT), on ABC.

Photos: “Red Hot”

Episode 4×03 “In the Line of Fire”

Officer Nolan and officer Chen report to a structure fire and suspect that there is more to the situation than meets the eye.

Meanwhile, after witnessing a sniper shooting, the team searches for the shooter and discovers that the perpetrator has a connection to one of their own.

Guest starring is Jenna Dewan as Bailey Nune, Dylan Conrique as Tamara Colins, Tru Valentino as Aaron Thorsen, Tricia Helfer as Claire Ivey and Aaron Leddick as Robinson.

“In the Line of Fire” was written by Robert Bella and directed by Dan Willis.

Air Date: Sunday, Oct. 10 (10:00-11:00 p.m. EDT), on ABC.

Photos: “In the Line of Fire”

Episode 4×02 “Five Minutes”

Officer Nolan and Officer Chen’s run-in with an infamous thief tips them off to a potentially big heist surrounding the Getty’s big gala event.

Meanwhile, Nolan works up the courage to ask Bailey out on date.

Guest starring is Jenna Dewan as Bailey Nune, Dylan Conrique as Tamara Colins, Tru Valentino as Aaron Thorsen, Tricia Helfer as Claire Ivey and Aaron Leddick as Robinson.

“Five Minutes” was written by Brynn Malone and directed by Lisa Demaine. 

Air Date: Sunday, Oct. 3 (10:00-11:00 p.m. EDT), on ABC.

Photos: “Five Minutes”

Episode 4×01 “Life and Death”

Officer Nolan and the entire team race against the clock to locate Lopez after she is kidnapped on her wedding day, not only to save her life but her unborn child’s.

Guest starring is Camille Guaty as Sandra “La Fiera” De La Cruz, Kamar De Los Reyes as Detective Sgt. Ryan Caradine and Kyle Secor as Agent Sam Taggart.

“Life and Death” was written by Alexi Hawley and directed by Bill Roe. 

Air Date: Sunday, Sept. 26 (10:00-11:00 p.m. EDT), on ABC.

Photos: “Life and Death”