Liv has discovered there are more zombies living in Seattle than she previously believed. In fact, there’s a private military contractor employing a small zombie army, and that army is preparing for the day humans learn of their existence. Major was exonerated for the crimes of the Chaos Killer, but is still considered a pariah. He manages to land a job with the one and only place that will hire him. Meanwhile, Blaine is accused of lying.

When Liv, Clive and Ravi arrive at the scene to investigate a fatal car accident, they begin to suspect foul play was involved. Both starving, Liv and Major consume the brains of the accident victims, a well-meaning father and his angsty teenage daughter. Meanwhile, when Clive is brought in for questioning about a family that was murdered, he’s forced to reveal his past history with them. Lastly, Peyton extends an olive branch to Ravi, and Major hits a road block in his search for Natalie.

To help Clive solve the murder of a lifestyle guru, Liv consumes his brain and takes on his zen approach to life. Ravi's old boss, Katty Kupps, is getting closer to discovering the truth while also getting closer to Ravi. Meanwhile, Blaine and Peyton continue their budding friendship, much to Ravi's dismay. Lastly, Major is struggling a bit at his new job.

Clive's patience is tested when Liv consumes the brain of a murder victim who had the reputation of being the ultimate office gossip. Meanwhile, Blaine and Peyton continue to grow closer as they wait to see if Ravi is able to reverse the effects of the cure. Lastly, Major is one step away from fulfilling a promise.

When Liv consumes the brains of a dominatrix, her bossy and controlling personality makes everyone a little uncomfortable, especially Clive. Meanwhile, Blaine and Peyton have a heart-to-heart.

To help Clive solve the murder of an irresponsible narcissist, Liv consumes her brain and literally becomes a hot mess. Meanwhile, Peyton learns some shocking news. Lastly, Ravi experiences a major setback.

When Liv and Clive work together to solve the murder of a very charming, but womanizing, preschool teacher, things get interesting when they bring his jealous girlfriend Piper in for questioning. Meanwhile, Peyton is assigned a very interesting case. Lastly, Blaine finds himself in a bad situation.

Liv shares the brain of a former daredevil with her new boyfriend, and the experience brings them closer. Blaine is back to his old ways. Meanwhile, Ravi makes progress in his new research. Finally, a discovery is made that could put Major in grave danger.

Peyton and Liv find themselves on a surprising wild goose chase. Ravi is terrified when the zombie truth hunters' plans are revealed. Elsewhere, Major finds comfort in an unexpected - and perhaps unwelcome - friend.

Liv and Blaine come to the rescue of one of their own. They consume the brains of a conspiracy theorist and paranoia ensues. Meanwhile, as they continue to search for conspiracy theories that may or may not exist, Liv researches Major's new friend. Finally, Ravi makes a surprising discovery of his own.

When Liv consumes the brains of someone from Ravi's past, not only does it have her wanting to sleep with every guy in Seattle, she also begins having some very intimate visions of Ravi. Meanwhile, Major is faced with a huge decision.

Liv uncovers the shocking truth about the virus and the far-reaching consequences of the vaccine. Majors exams his future as a human. Blaine makes a business proposal.