Chip is arrested for his crimes after the girls courageously come forward.

Imogen gives birth to a healthy girl and decides to let Aria Montgomery and Ezra Fitz (a nod to the original series) adopt her.

"Final Girl" effectively transitions the franchise from a teen soap-mystery into a legitimate horror-slasher. It ties up the 1999 mystery while leaving enough blood on the floor to fuel the second season, Summer School .

The connection traces back to 1999: Clanton had a secret relationship with Angela’s mother, Rose Waters, fathering both Angela and Archie. This makes Clanton the grieving father and Archie the vengeful brother. The Motive: A Sick Kind of Justice

The finale delivers a dual reveal. is the mastermind behind the "A" persona, but he didn't act alone. The physical brute stalking the girls is his son, Archie Waters .

In a brutal showdown, Imogen manages to overpower Archie, proving herself the ultimate "Final Girl." The Aftermath and the "A" Cliffhanger The finale ends with a mix of closure and new nightmares:

The season finale of Pretty Little Liars: Original Sin , titled successfully untangles a decades-old web of trauma while delivering a slasher-flick ending that honors the PLL legacy. The Identity of "A" and Archie