Johnny Galecki is probably the best-known Roseanne veteran to have appeared on The Big Bang Theory, but he's far from the only actor to pop up on both shows.

With the sitcom following the academic career of Sheldon, jumping from elementary school to college in no time, what about ...

Before Freddie Prinze Jr. and Jennifer Love Hewitt reunited for the 'I Know What You Did Last Summer' reboot, they had not ...