Dean (Jensen Ackles) is transported back in time and is shocked when he lands in Lawrence, Kansas.

However, that shock turns to amazement after he runs into a young John Winchester (guest star Matthew Cohen) and Mary (guest star Amy Gumenick) who have just fallen in love. Dean isn't sure why he was sent back so he begins to enjoy the time with his parents and newfound grandfather (guest star Mitch Pileggi, “The X-Files”), who may be hiding a secret that is key to Sam (Jared Padalecki) and Dean's entire predicament. [Edit]

This episode, which features guest star Mitch Pileggi (“The X-Files,” “Stargate: Atlantis”) as Sam & Dean Winchester’s maternal grandfather, begins with the angel Castiel (guest star Misha Collins) transporting Dean (Jensen Ackles) back in time to Lawrence, Kansas in 1973. In what promises to be a very revealing hour, Dean not only encounters his parents as a young couple in love, but also meets his mother’s family for the first time and learns the origin of a startling turn of events that will shape the future of the entire Winchester family – and possibly his relationship with Sam (Jared Padalecki) - forever. “In The Beginning” was written by Jeremy Carver and directed by Steve Boyum. [Edit]