Before acting fame, Katey Sagal was a singer and Harlette for Bette Midler. Watch her rare 1987 live performance of “Love Gets You Sooner or Later.”

Sometimes the side characters stole the show on "The Big Bang Theory." For this list, we’ll be looking at times the long-running sitcom’s supporting cast gave us main character energy. Our countdown includes Zack & the Science Dudes, Beverly Hofstadte...