Here is the description of one of the most anticipated Winchester episode of Supernatural. It's another rare occasion to see the Winchesters together in one episode! Here comes Grandpa Winchester!
Description of 8.12 As Time Goes By
SAM AND DEAN MEET THEIR GRANDFATHER — Sam (Jared Padalecki) and Dean (Jensen Ackles) are stunned when a man who claims to be Henry Winchester (guest star Gil McKinney), their grandfather, suddenly appears in their hotel room demanding to know where he can find John Winchester. Henry has time-traveled to stop a demon named Abbadon (guest star Alaina Huffman) and was looking for John’s help. Through Henry, Sam and Dean learn more about their father and the Winchester blood line. Serge Ladouceur directed the episode written by Adam Glass. Source: KSiteTV
If you are in Australia, Supernatural returns to Eleven on Monday 21st January! YAY!! Rejoice!!