The Big Bang Theory universe, spanning the flagship, Young Sheldon, and Georgie & Mandy’s First Marriage, features a vast array of characters, but only a select few have appeared in every show. These performers embody key figures tied to the Cooper family, bridging the original sitcom’s nerdy humor with the prequel’s coming-of-age drama and the sequel’s family-focused comedy.
Their roles range from main cast members to recurring characters. Their consistent presence in The Big Bang Theory, Young Sheldon, and Georgie & Mandy’s First Marriage offers continuity, enriching the interconnected narratives. With Stuart Fails to Save the Universe set to expand the universe, their involvement remains a cornerstone of the quirky franchise’s enduring appeal.
Montana Jordan
Montana Jordan is one of the few actors to appear in every The Big Bang Theory universe show so far: The Big Bang Theory (2007–2019), Young Sheldon (2017–2024), and Georgie & Mandy’s First Marriage (2024–present). Jordan plays Georgie Cooper, Sheldon’s older brother, debuting as a teen in Young Sheldon and briefly appearing in The Big Bang Theory as adult Georgie.
In Georgie & Mandy’s First Marriage, he leads as the charming, entrepreneurial Georgie, navigating marriage and fatherhood. His consistent presence ties the franchise together, showcasing Georgie’s growth from a rebellious teen to a family man. Fans praise Jordan’s charisma and versatility, cementing his role as a cornerstone of the Big Bang Theory universe’s narrative continuity.
Lance Barber
Lance Barber is another actor appearing in all three The Big Bang Theory universe shows. Barber plays George Cooper Sr., Sheldon’s father, with a gruff yet heartfelt charm. In Young Sheldon, Barber is a central figure as the Cooper patriarch, while in The Big Bang Theory, he appears in a flashback cameo.
Barber guest-stars in Georgie & Mandy’s First Marriage, maintaining continuity despite George Sr.’s death in Young Sheldon, through flashbacks or narrative ties. His versatile performance bridges the franchise’s humor and emotional depth. Fans of The Big Bang Theory, Young Sheldon, and Georgie & Mandy’s First Marriage laud Barber’s warmth, making him vital to the universe’s cohesive storytelling.
Melissa Tang
Melissa Tang is the third and final actor who has appeared in all three The Big Bang Theory universe shows, showcasing her versatility. In The Big Bang Theory, she played Mandy Chow, a marine biologist whose brief role stirred drama in Leonard and Penny’s relationship. In Young Sheldon, Tang portrayed Ms. Fenley, a music teacher who recognized Sheldon’s musical talent.
Tang later guest-starred as Jackie, a relatable mom, in Georgie & Mandy’s First Marriage Season 1, Episode 8 (“Diet Crap”), which aired January 30, 2025. During the episode, she bonded with Mandy over parenting struggles. Tang’s ability to embody distinct characters cements her as a vital link in the franchise’s evolving narrative.
Georgie & Mandy’s First Marriage will return for its second season on Thursday, October 16, 2025, on CBS.
