While investigating a case, Liv eats the brains of a country-singing waitress. Detective Babineaux meets a female FBI agent who will be working out of their offices. Blaine tries to entice a former business associate to come back to the dark side. Meanwhile, Peyton’s return is messing up Ravi’s game, and Major continues his downward spiral.

Liv, Detective Babineaux and Ravi investigate the mysterious death of a peewee basketball coach. Liv, consumed with overzealous coach brains, gives Major a much needed pep talk. Meanwhile, things get a little crazy when Blaine and Ravi are forced to work together to recreate the cure. Lastly, Detective Babineaux receives a surprise visit from Suzuki's widow Helen.

Liv unwittingly crosses paths with the most dangerous man in Seattle while investigating the murder of degenerate gambler Harry. Detective Babineaux has a super-fan moment when he and Liv question NBA Hall of Famer Calvin Owens at Harry’s funeral. Meanwhile, Blaine’s father makes a huge discovery, and Ravi delivers some bad news. Lastly, Evan has a big secret to share with Liv, and Major continues to struggle.

Liv consumes the brains of a death-obsessed illusionist who was murdered in cold blood during a magicians’ convention in Seattle. As Liv and Detective Babineaux investigate the case, she uses her new skills to help narrow down the suspect pool. Meanwhile, Blaine gives Liv some interesting news, and Ravi makes a decision but things don’t end up going quite as planned. Lastly, Major continues to distance himself from Liv.

Detective Babineaux arrives at the crime scene of a wedding planner who was shot to death, and is shocked to realize that he used to date the victim. To make matters worse, we learn that the murder victim was stalking Detective Babineaux, and that he is now the number one suspect in her murder. Liv and Ravi pose as an engaged couple in order to infiltrate the victim's wedding planning business. Meanwhile, Major is having a tough time dealing with Liv on stalker brains.

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.

When a Dungeon Master is killed, Liv and Clive discover he was up to more than just playing in his mother's basement. Meanwhile, Blaine's experiment does not go as planned. Lastly, Ravi stumbles across some new information that could prove deadly.

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.