The Big Bang Theory is also a Rosanne reunion.

Back in the 90s, Johnny Galecki played one of the main characters on the hit American sitcom, Roseanne. A couple of episodes into the first season of The Big Bang Theory, he reunites with his Roseanne co-star Sara Gilbert, who used to play his girlfriend Darlene Connor but then played his ex-girlfriend Leslie on The Big Bang Theory. Sheldon’s mom, Laurie Metcalf, also played Jackie Harris on Roseanne. Aww!