While investigating a murder case with no body and no brain to eat, the only evidence Liv and Clive have to work with is a grainy video and a little bit of blood found at the crime scene. Meanwhile, Blaine is up to his old tricks.

Liv, on fitness guru brains, and Clive continue investigating a murder with no body and no evidence. Meanwhile, Peyton approaches councilman Zed with a request but doesn’t get the answer she was hoping for. Lastly, Liv surprises Major with a thoughtful gesture just when he needs it the most.

While investigating the deaths of Gulliver and Nancy, the dynamic duo of Seattle's winning dance team, Liv and Ravi go undercover as dance partners to size up the other contestants aka the prime suspects. Meanwhile, Peyton confronts Major after she's told that one of his soldiers was out of line during a routine lice check at the school. Lastly, Clive and Bozzio receive a shocking surprise during Lamaze class.

Liv, Clive and Ravi investigate the suspicious death of Cornell Piercey, the head of Piercey Corp, a successful traffic app company. Melissa Schultz, Cornell's ex-girlfriend, is now running the company, makes an interesting reveal to Liv and Clive. Meanwhile, Peyton is focusing on maintaining positive zombie PR in the city. Lastly, Blaine is intrigued when he meets Al Bronson of Bluster Magazine, as she is not at all what he was expecting.

While investigating the death of independently wealthy, 19-year-old, Harris Miller, Liv, on brain à la Ferris Bueller, attempts to cheer up Ravi who has been spiraling after learning some unfortunate news. Meanwhile, after a nasty fall at the crime scene, Clive is forced to continue his part of the investigation via FaceTime. Lastly, things are suddenly going from bad to worse for Blaine.

While investigating the murder of Eleanor Barba, a chef at a high-end restaurant, Liv consumes her brain and becomes an unrelenting perfectionist who knows just how to break a person to their very core. Meanwhile, Major is on a mission to find out who is betraying the commander.

Liv and Ravi each consume the brain of a very dislikable car salesman and inherit his competitive nature.

Liv and Clive investigate the murder of Miss Teen Seattle beauty pageant contestant, Laurie-Beth Spano, who went into anaphylactic shock onstage in 1999 and ended up in a coma. At the time, police arrested rival contender Velma Charlet for spiking Laurie-Beth's makeup and she was given a four-year sentence. In present day, Laurie-Beth has passed away and Clive has arrested Velma, for her murder. Velma claims to be innocent and Liv consumes Laurie-Beth's brain in hopes of tracking down the murderer.

While investigating the murder of private eye Mick Chisel, who was stabbed in the head with an ice pick, Liv consumes Chisel’s brain in hopes of breaking down how this gruesome murder took place.

Liv and Clive investigate the death of an old school drag queen which leads Liv to eat and shift into the queen’s brain. Meanwhile, Ravi reaches out to Major with an interesting request.

While Major faces a changing of the tide in Seattle, Liv, Clive and Ravi undertake a mission impossible in Atlanta to retrieve the final zombie cure.

As Liv, Ravi and Clive race to finalize the cure, Peyton faces a showdown with Blaine, and Major takes a bold gamble to save Seattle once and for all.