Jordan Parrish

Jordan Parrish is a supporting character in Season 3, Season 4, Season 5 and Season 6 of Teen Wolf. He made his first appearance in the second half of the third season as a newly-hired Sheriff's deputy at the Beacon County Sheriff's Station, where he worked under the leadership of Sheriff Noah Stilinski. After several weeks of working at the department, Parrish admitted to Stilinski that he moved to Beacon Hills because he felt drawn there, which was the first indication that he wasn't as ordinary as he seemed. During this time, he was promoted to the position of Deputy Sheriff, acting as Stilinski's second-in-command.

Parrish quickly joined Scott McCall and his pack, and in Season 5 Status Asthmaticus, it was eventually discovered by Lydia Martin during her research that Parrish was, in fact, a Hellhound, a spectral dog that is said to ride with the Wild Hunt of Germanic folklore and is known for being a guardian of supernatural places. However, since Lydia was driven into catatonia by Theo Raeken's attack shortly after this discovery, Parrish did not officially learn his supernatural identity until Season 5 The Sword and the Spirit, when Gerard Argent confirmed it by attempting to set him on fire, which triggered him to reveal his Hellhound fangs for the first time.

In A Credible Threat, it was revealed that the Hellhound is actually an amortal being who is beyond life and death and who can possess vessels when it is needed on Earth. The Hellhound, who is known as Cerberus and many other names, possessed Parrish when he was blown up in an explosion while serving in Afghanistan, which happened to occur at the exact moment that Scott McCall, Stiles Stilinski, and Allison Argent drowned themselves in the surrogate sacrifice ritual in Alpha Pact. Though the Hellhound claimed Parrish was dead, it was implied by Lydia (who, as a Banshee, knows when a person is dead or dying and who the person is through premonitions) that he had not truly died, and that it could be possible for the Hellhound and Parrish to work together to fight the Beast of Gevaudan.

As Lydia predicted, Parrish and Cerberus ultimately merged themselves together, working as one unit instead of Cerberus taking control when Jordan was asleep and not allowing Parrish the conscious use of their powers. It was with the help of Parrish and his newly-gained Hellhound abilities that the McCall Pack was able to finally defeat and kill the Beast once and for all.