Teen Wolf: Season 3, Episode 16

3 - 16: Illuminated

Isaac describes the hooded figures that attacked him to Allison and her father. Kira reveals to Scott that her body emanates a glowing aura when a photo is taken of her, and with the help of Stiles, the two break into the Sheriff's office and erase similar photos from Kira's cell phone. Danny and Ethan throw a Halloween party in Derek's empty loft. During the party, Scott realizes that Kira's "aura" resembles a fox, and Allison discovers what appears to be a reverse number "5" mark behind Isaac's ear. Ethan and Lydia are also attacked by the hooded figures and marked the same way. Stiles discovers that his handwriting matches the coded message written on the chalk-board, instructing Barrow to kill Kira.