What happened in Mexico did not stay in Mexico on Teen Wolf Season 4 Episode 1.
Quite the opposite, in fact. It was broadcast on national television!
For reasons far from clear at first, the opening installment plopped fans right down south of the border, as Stiles and Lydia were debating the merits of a plan.
We then witnessed them wander into a hidden disco that is, of course, also the secret base of the Calaveras family of hunters.
Scott, Kira and Malia were also there, helping out while Stiles and Lydia attempted to bribe Mama Calaveras with Japanese gangster money.
But the hunters had an answer, specifically one that began with wolfsbane-laced mist and ended with rather extensive torture.