: While his friends find partners, Raj continues to struggle with his selective mutism, even attempting to find companionship through a mobile phone's virtual assistant. Cast & Guest Appearances
: Leonard Nimoy provides the voice for a Sheldon-sized Spock action figure, and Brent Spiner appears alongside series regular Wil Wheaton . The Big Bang Theory Season 5 Complete Pack
: Stephen Hawking makes his legendary first on-camera appearance, while astronaut Mike Massimino joins as a recurring guest during Howard’s space arc. : While his friends find partners, Raj continues
: 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. : While his friends find partners