The Big Bang Theory Season 5 Complete Pack -

: Sheldon and Amy formalize their unique bond with a "Relationship Agreement," while Howard and Bernadette prepare for their wedding, culminating in Howard's mission to the International Space Station.

Available on both Blu-ray and DVD , the season set includes several exclusive extras: The Big Bang Theory Season 5 Complete Pack

: Laurie Metcalf returns as Mary Cooper, and Christine Baranski reprises her role as Leonard’s mother, Beverly. "Complete Pack" Features : Sheldon and Amy formalize their unique bond

: Stephen Hawking makes his legendary first on-camera appearance, while astronaut Mike Massimino joins as a recurring guest during Howard’s space arc. The season is notable for bringing together icons

The season is notable for bringing together icons of science and science fiction:

: Amy Farrah Fowler (Mayim Bialik) and Bernadette Rostenkowski (Melissa Rauch) are promoted to main characters, providing a female social circle for Penny that mirrors the guys' group.