The Brady's are back... just in time for Christmas.

Christopher Knight, who played Peter Brady, talked about the premise of the upcoming movie, Blending Christmas.

"It's filled with that feeling of the holidays... which is warm and generous and ultimately presenting a happy ending. That is what the Brady's were all about! Providing you a resolution in 30 minutes or less," Knight said.

In the movie, Aaron O'Connell's character wants to propose to his girlfriend, played by Hailey Duff, surrounded by both their families while on Christmas vacation.

"Blending is in the title... you got to go with the original blended family. We're the original blended's!"

Knight shared that, after having worked together for 52 years, he considers his co-starts as members of his family.

Blending Christmas premieres this Sunday, December 12th, on Lifetime.