
When "The Big Bang Theory" concluded its 12-season run in 2019, fans felt a void that "Young Sheldon" quickly filled. This spin-off, focusing on the early years of Sheldon Cooper, features Iain Armitage as young Sheldon and Jim Parsons' voiceovers for continuity. Chuck Lorre and Steven Molaro, the masterminds behind both shows, have a knack for reusing beloved actors.
Let's dive into the intriguing crossover cameos between these two popular series.

Melissa Tang, known for her roles in "The Kominsky Method," brought her charm to both "The Big Bang Theory" and "Young Sheldon." In "The Big Bang Theory," she stirred things up as Mandy Chow, Leonard's former fling, creating tension between newlyweds Leonard and Penny.
But this hiccup in their relationship only served to strengthen their bond.
Transitioning to "Young Sheldon," Tang played Ms. Fenley, a high school music teacher.
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