When a younger version of The Big Bang Theory’s Howard showed up in Young Sheldon season 2, the sitcom spinoff managed to make his appearance even sweeter with a clever cameo casting arrangement. Throughout The Big Bang Theory, comedic actor Carol Ann Susi proved a fan favorite thanks to her role as Howard’s overbearing, raspy-voiced mother. Although Ms. Deborah "Debbie" Wolowitz never appeared onscreen, her gravelly yelling was heard often throughout the sitcom’s long run. The Big Bang Theory mined a lot of comedic gold from Debbie’s well-timed interruptions but, unfortunately, the series had to retire the character when Susi passed away in 2014.
