When The Big Bang Theory debuted in 2007, audiences were introduced to a world where comic books and theoretical physics collided delightfully. Over 12 seasons, the show, created by Chuck Lorre and Bill Prady, became a pop culture staple, showing that being a nerd was, ironically, pretty cool.

The show's triumph, largely attributed to its cleverly scripted quirky humor, also paved the way for a growing universe of spin-offs. If you're eager to explore all the series this franchise offers, here's a detailed guide to each show in the order they premiered and find out where you can stream them all online.

The Big Bang Theory

The Big Bang Theory follows the lives of Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons), two brilliant yet socially awkward Caltech physicists who enjoy geeking out over comic books with their equally awkward friends, aerospace engineer Howard Wolowitz (Simon Helberg), and shy astrophysicist Rajesh Koothrappali (Kunal Nayyar). Everything changes when Penny (Kaley Cuoco), a confident and street-smart aspiring actress, moves in next door.

Young Sheldon

In 2014, fans curious about Sheldon's early years were treated to Young Sheldon, a heartfelt prequel series exploring his childhood in East Texas. Iain Armitage stepped into the role of a young Sheldon Cooper as he struggles to fit in with his peers. The show also highlights Sheldon's mother, Mary Cooper (Zoe Perry), his father, George Cooper Sr. (Lance Barber), his feisty Meemaw Connie Tucker (Annie Potts), and his siblings, Missy Cooper (Raegan Revord) and Georgie Cooper (Montana Jordan).

Georgie & Mandy's First Marriage

Expanding The Big Bang Theory universe further, Georgie & Mandy's First Marriage shifts the focus to Georgie Cooper (Montana Jordan) and Mandy McAllister (Emily Osment). First introduced in Young Sheldon, Georgie and Mandy's relationship evolved when an unexpected pregnancy brought them closer. As the title suggests, the couple eventually married, leading to a successful first season. The show has since been renewed for a second round.

Untitled Spin-off (In Development)

A new Big Bang Theory spin-off is currently under development, once again helmed by Chuck Lorre. While details remain under wraps, early reports suggest the show will shift focus to supporting characters from the original series, such as comic book store owner Stuart Bloom (Kevin Sussman), his witty girlfriend Denise (Lauren Lapkus), and geologist Bert Kibbler (Brian Posehn). It's uncertain whether main cast members from the flagship show will appear in the spin-off.