The gang traveled to Mexico to save Scott and Kira from Kate; Scott and Peter finally came to blows in Teen Wolf’s season 4 finale, “Smoke and Mirrors.”

The Pack Heads Back To Mexico

Kira (Arden Cho) wakes up, still trapped underground in La Iglesia. When she ventures outside, she is attacked by a Berserker, but recognizes Scott’s (Tyler Posey) tattoo when he grabs her. Kate (Jill Wagner) comes out of the shadows and explains to Kira that she has the power to control the Berserkers, and the power to create them. But, she needs to make him fully animal, and is testing his loyalty by having him attack his sort of girlfriend. It works, and Scott stabs Kira in the stomach, leaving her bleeding on the floor.

In Beacon Hills, Stiles (Dylan O’Brien) tells his dad that they have to go to Mexico to save Scott and Kira, but Sheriff Stilinski (Linden Ashby) isn’t convinced that they’re down there – he’s not going to take some three-eyed mental patient’s word for it. But, of course, Stiles goes anyways, and, after some begging, agrees to bring Liam (Dylan Sprayberry) along. Malia (Shelley Hennig) is also going, and so are Derek (Tyler Hoechlin), Braeden (Meagan Tandy) and Peter (Ian Bohen), much to Stiles’ annoyance. According to Peter, he’s the one who knows the most about Berserkers other than Argent – the werewolf hunter is conveniently MIA after Peter left him for dead in the sewers – so Derek allows him to come along, because, without his werewolf powers, he’s feeling a bit helpless.

It’s the night of the full moon, so Stiles and Derek ride with Liam to try to help him learn to control his transformation, leaving Malia to ride with her father, Peter. Malia, apparently completely back on Team Stiles, listens to her boyfriend and tries to keep the father-daughter bonding to a minimum. In the back of Braeden’s US Marshall security van, Liam starts to lose it, and Derek tries giving him the Hale family talisman and teaching him the mantra, “Alpha, Beta, Omega.” It doesn’t do the trick, so Stiles rushes in with the mantra heard earlier this season: “The sun, the moon, the truth.” With their help, Liam successfully controls his transformation, and it looks like they might actually have a shot at saving Scott. Meanwhile, Peter tries to convince Malia that Scott is wrong: trying to hold onto your humanity is not the same as control, and sometimes you have to kill. For example, when you come face to face with a Berserker. As Peter makes sure to tell everyone multiple times, there is no saving a Berserker, they must be killed.

Scott And Peter Go Head To Head

Meanwhile, Lydia (Holland Roden) is MIA. She went to the school to recover Kira’s jacket to help Malia track her sent and was attacked by a Berserker, who stole her phone and locked her in the basement. Before leaving for Mexico, Liam called his friend Mason (Khylin Rhambo) and asks him to go look for Lydia. Unfortunately, Mason ends up trapped in the basement with Lydia, and, while he doesn’t quite understand what the hell the Berserker is, or what it’s doing to them, he decides to help Lydia escape. Armed with two baseball bats, the two of them don’t get very far, but luckily the Sheriff arrives just in time, and he’s come armed with a landmine. The Berserker explodes into hundreds of little skull pieces, and Lydia tells the Sheriff she knows why the Berserker was trying to keep her from going to Mexico: her Banshee senses are telling her that Peter and Kate are going after Scott.

In La Iglesia, Kira summons a vision of her mother that guides her to learn how to use her Kitsune power to heal herself. In doing s, she finds a throwing star: her first tail. By the time Stiles finds her, the whole group is scattered. Derek is injured, slowly bleeding out in front of the ruins while Braeden goes after the Berserkers and Kate, and Malia, Peter and Liam are in the tunnels, fighting a particularly aggressive Berserker – Scott. Kira tells Stiles that Scott is the Berserker and they rush in just in time to stop Malia from killing Berserker Scott. The fight pauses, but Berserker Scott is still under Kate’s control, and he goes after Liam, quickly getting him in a chokehold. Liam tries to reason with Scott, to find his humanity, and reminds him of what Scott told him when he first changed into a werewolf: “You’re not a monster. You’re a werewolf, like me.” Liam’s alpha-beta bonding does the trick, and Scott is able to rip his Berserker skull off and become the alpha again.

With Scott now free of his Berserker shell, he exposes Peter as the enemy, and Peter transforms, ready to fight. The showdown between the new, true alpha and the ex-alpha who turned him begins. Liam, Malia and Kira all want to help Scott, but he tells them to stay back: he needs to defeat Peter on his own. As the fight goes on, and Scott gets knocked down one too many times, Liam steps forward, and when Scott sees Peter try to hurt his beta, he is overcome with focus and power. Calmly, he blocks Peter’s punches and attacks, and, with a few well-placed punches of his own, he manages to knock Peter down.

Chris Argent Lets Go Of Kate

Outside, Braeden wasn’t having much luck fighting Kate and her Berserker on her own, but her brush with death was cut short when Argent (JR Bourne) and Parrish (Ryan Kelley) arrived with the Calaveras army, immediately opening fire. Things still aren’t going their way when suddenly, Derek appears – he’s not dead, but he’s not what he used to be either. He now has the power to transform completely into a wolf (similar to how Malia changed into a coyote after her mother and sister died). Kate is stunned. Derek was supposed to be dying, and instead he has become something more. Whatever he is, he is clearly powerful, as he is able to take Kate down and crush the skull of a Berserker with his bare hands. Kate runs, but not before Argent hits her with a wolfsbane bullet.

Kate and Chris Argent finally have it out in the tunnels under La Iglesia. She tries to convince her brother that Scott killed Allison, but Chris doesn’t believe her. “Allison died. She died saving her friends. Who would you die for?” he asks.

In the end, Chris doesn’t want to kill Kate, but he’s not going to try to save her anymore. Kate escapes off into the distance, and later Argent informs Scott that he has made a deal with the Calaveras: he will help them find Kate, and they will leave Scott and his pack in peace.

Who Is The Desert Wolf?

While it may seem like all Teen Wolf’s season 4 loose ends have been tied up, a few major question remain:

Who is the Desert Wolf? We already know that Peter identified Malia’s mother as the Desert Wolf, but her identity remains unknown, and, coincidentally, Braeden let slip that, as a US Marshall, she was tasked with tracking someone called ‘Desert Wolf,’ but was never able to find her, causing her to become so obsessed with the case, she left her job.

What is Parrish? At the end of the episode, Lydia stopped by the Sherrif’s station and dropped off a copy of the Argent Beastiaire. If he wants to find out what he is, the answer is probably in the book, she says.

The battle is over. Scott, Derek and their pack have won the war, for now, and it’s time to move on. Derek leaves with Braeden, to go where, we don’t know, and Stiles, Scott, Kira, Malia and Liam return to Beacon Hills High. As for Peter, they dope him up with enough wolfsbane to transport him safely to Eichen House, where they lock him up in the supernatural ward and put him in a mountain ash-laced cell with the three-eyed man.