Love is in the air after Liv eats the brains of a hopeless romantic, and she can’t stop herself from meddling in Clive’s relationship. Major and Liv continue to try to work through their differences. Meanwhile, Blaine is approached with an interesting offer.

Liv and Clive discover the murder they are investigating was the work of a serial killer. Meanwhile, Major enters dangerous territory.

Liv and Clive investigate the murder of a pretentious theater actor. Meanwhile, Ravi makes a huge sacrifice for Peyton. Lastly, Blaine makes a startling discovery.

There's a zombie serial killer on the loose and new Seattle is on lockdown. Liv is trapped in the morgue on white rapper brain and Clive and Ravi are playing Dungeons & Dragons. Meanwhile, Blaine concocts his most sinister plan to date. Lastly, Major is on the hunt for the killer.

Liv does Clive a solid and agrees to consume germaphobe brain during flu season. Ravi continues his role as surrogate father to Isobel. Major finally gets to the bottom of things, and Chase continues to spiral out of control. Lastly, Peyton struggles with a very important decision.

While Major whisks Liv out of Seattle for her own protection, Ravi eats the brains of a narcissist to help Clive investigate Brother Love for murder.

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.

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.

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.