via press release:
The door has been opened. An evil has been unleashed. Check out the Teen Wolf Trailer For the Season 3: Part 2 Premiere On Monday, January 6 at 10/9c
Season Premiere Description
The season premiere episode picks up three weeks after saving the lives of their parents, Scott, Stiles and Allison begin to suffer strange side effects from their ritual sacrifice. At the same time, the newly enlightened Sheriff Stilinski scours through old cases, reassessing whether each could have had supernatural causes. Throughout the upcoming season, Scott struggles to find his place as an Alpha, while he, Allison and Stiles begin to experience strange side effects as a result of reigniting the power within Beacon Hills. They soon discover that the answer to their problems may be found in a new student named Kira (played by Arden Cho), a girl with remarkable powers of her own.