The Big Bang Theory universe — spanning the original series, Young Sheldon, and Georgie & Mandy’s First Marriage — has introduced countless memorable characters, but only a few have appeared in every show. These standout actors embody the spirit of the Cooper family, seamlessly connecting the original’s geeky humor with the prequel’s heartfelt coming-of-age and the sequel’s family-driven comedy.
Their ongoing presence across the franchise keeps the world cohesive and nostalgic, reminding fans why this sitcom universe continues to thrive. And with Stuart Fails to Save the Universe on the horizon, these familiar faces remain at the heart of its enduring charm.
Montana Jordan: The Heart of the Big Bang Theory Universe
Montana Jordan is one of the rare actors to appear in every Big Bang Theory universe show to date — The Big Bang Theory (2007–2019), Young Sheldon (2017–2024), and Georgie & Mandy’s First Marriage (2024–present). He first brought Georgie Cooper, Sheldon’s older brother, to life as a rebellious teen in Young Sheldon, later making a brief but memorable appearance as adult Georgie in the flagship series.
Now leading Georgie & Mandy’s First Marriage, Jordan shines as the charming, entrepreneurial Georgie navigating marriage and fatherhood. His evolution from witty troublemaker to responsible family man ties the franchise together, while his charisma and warmth have made him an indispensable part of the Big Bang Theory universe’s ongoing story.
Lance Barber: The Soulful Father of the Cooper Family
Lance Barber is another actor whose presence spans all three series in the Big Bang Theory universe. As George Cooper Sr., Sheldon’s father, Barber blends gruff humor with heartfelt sincerity. In Young Sheldon, he anchors the Cooper household as its patient and hardworking patriarch, while his brief flashback cameo in The Big Bang Theory offers fans a touching glimpse of George Sr.’s legacy.
In Georgie & Mandy’s First Marriage, Barber returns through flashbacks and narrative connections, maintaining continuity despite his character’s death in Young Sheldon. His layered, emotionally grounded performance bridges the franchise’s humor and heart, making him a vital thread in its storytelling fabric
Melissa Tang: The Chameleon of the Big Bang Theory Universe
Melissa Tang completes the trio of actors who’ve appeared across all three shows — a testament to her impressive range. In The Big Bang Theory, she portrayed Mandy Chow, the marine biologist who briefly caused tension between Leonard and Penny. Later, in Young Sheldon, she appeared as Ms. Fenley, the supportive music teacher who spotted Sheldon’s early musical potential.
Most recently, Tang guest-starred in Georgie & Mandy’s First Marriage Season 1, Episode 8 (“Diet Crap”), which aired on January 30, 2025. As Jackie, a relatable mom navigating the chaos of parenting, she shared heartfelt moments with Mandy that resonated deeply with fans. Tang’s ability to bring distinct, grounded characters to life across the franchise cements her as a quiet but essential link in its ever-evolving universe.
