While one mysterious killer was revealed in iZombie season 1, episode 12, “Dead Rat, Live Rat, Brown Rat, White Rat,” another more enigmatic murderer emerged.

Cheerleader brain, served rare

The episode opens as the now zombified Sebastian gets hit by a car full of teens. They were stoned and in a stolen car, so they bury the seemingly dead body. Cue Night of the Living Dead shot. Sebastian snaps Kimber’s neck and eats her brain, sending the three remaining teens running in fear. Two weeks later, a man jogging in the woods discovers her dismembered foot.

At the crime scene, Liv states that Kimber went to school with Liv’s brother Evan. Realizing that Kimber was killed by a zombie, Liv starts to freak out about the rampant zombies. Worrying about what Major is about to do, she vows to kill Blaine before anyone else gets hurt.

Totes

At the morgue, Liv takes liquified shots of Kimber’s brain. Unfortunately, Hope, the ex-zombie rat, is dead. As the cheerleader peppiness sets in, Liv helps Clive question Kimber’s best friend Tate. Tate plays a voicemail Kimber left on the night of her death, leading Clive down the path of finding both the bar and the man Kimber was seeing.

The three other teens from the night of Kimber’s death make up The Ass Hats. When the teens give a generic response to where they were the night of the death, Liv brain flashes to the moment right before the teens hit Sebastian. At their house, Peyton and Liv have a peppy conversation akin to their old relationship.

Reviewing security footage, Clive discovers the stolen car. Going back to the band practice garage, the investigation team discover Kimber’s boyfriend Nate slaughtered.

Mushrooms, brains — same difference

Talking over Nate’s body, Ravi decides that it’s time for Liv to eat this teen’s brain. As Ravi rejoices over the creation of a new zombie rat, Clive unknowingly eats brain pizza. Yuck. Clive found threatening messages from (presumably) Sebastian on Nate’s phone.

Liv turns stoner when Nate’s brain activates, as she brain flashes to Cameron threatening Nate about the former going to the police. In true I Know What You Did Last Summer fashion, Teresa comes by to say that she thinks she’s next. We agree, Liv, Seriously, I’m So Not Ever Forgetting What You Did Last Summer would be a great ending to that series. Cameron texts Teresa and tells her not to trust the police.

At the morgue, a 91-year-old woman’s body is brought in, sans brains, rising suspicions of a serial killer. Liv decides to drink some more cheerleader to get it back together. Clive texts Liv Teresa’s police sketch, revealing Sebastian as the killer.

I’m a zombie

Blaine tells his lackey to find the missing brains, while Major vlogs his discoveries about zombies. Posing as a health inspector, Major spies in on the meat shop. Ravi and Major have a fun conversation about a date Ravi’s bringing Peyton on.

Julien realizes that Major was the “health inspector” after the inspector is described as having “good hair.” Yes, we get it, Robert Buckley’s pretty. Major buys some more guns from the back of some guy’s trunk. Where is he getting the money for all of this? Oh yeah, toss on a grenade too while we’re at it.

Peyton is attacked by Sebastian, but is still stirring. A fight ensues between him and Liv of epic proportions. Liv stabs him through the head as Peyton wakes up. Liv’s a zombie, Peyton’s in the know, and we’re all good. Maybe? No, Peyton ran away, things are so totally not good.

Teresa discovers a bloody hotel room as the door slams behind her. Struggling to dial 9-1-1, a bloodied Teresa doesn’t answer the responder. Major’s the guy who knew too much, as Julien has our pretty boy strung up. Evan drops by to give his application, and Blaine “hires” him on the spot once he realizes Evan’s connection to Liv.

iZombie airs Tuesdays at 9 p.m. on The CW. Next week is the season 1 finale episode.