What happened to Hanna after she was struck by a car on "Pretty Little Liars" mid-season finale has been revealed. A less than a minute video shows that Hanna is still alive although unconscious. She is lifted on a stretcher and brought to the hospital while her three friends, Aria, Spencer and Emily, watch in concern. Before leaving the scene, Aria catches a glimpse of something unusual.

No longer just threatening to reveal secrets, the all-knowing "A" has stepped up the game and nothing is off limits in the second half of the first season. And while they work hard to protect what they know, the four girls are also on the hunt to learn the truth about what happened to Alison the night she disappeared.

The second half of season 1 will debut on January 3. New actors who have been tapped to play a role in the new chapter are Lindsey Shaw as Emily's swim teammate, Alona Tal as Simone, and Tyler Blackburne as Caleb.

In anticipation of the premiere, ABC Family will launch a campaign to build awareness and engage the show's fans. Kicked off October 31, the campaign allows consumers of a mobile application provider to "check-in" with television shows, movies, music and books under the supervision of GetGlue. Once check-in, consumer will get holiday-themed collectible stickers of show characters from the network by mail.