After 12 years and 279 episodes, The Big Bang Theory wrapped up its run in 2019 and the final shows were crammed full of references to past storylines and characters. Here's a look at everything that ...

While we can't confirm whether Leonard, played by Johnny Galecki, will appear in the upcoming The Big Bang Theory spin-off, ...

The Big Bang Theory ended, Leonard marks his first franchise story, and it is so much better than just a Young Sheldon cameo.

In The Big Bang Theory's "The Leftover Thermalization," Howard has one last meal of his mom's food with Sheldon, Penny, Leonard, and the crew.

The finale of Young Sheldon ended one story and started a new one. It fit like a glove in The Big Bang Theory, providing fans with the bridge between child prodigy and Caltech genius that they had ...