Jason Alexander
Our dear George from Seinfeld came to the Two and a Half Men set to play Dr. Goodman; an adulterous cardiologist Alan visited in the show’s 200th episode. Alan had just gotten home from the hospital after having a heart attack, and everyone was giving him extra attention. After going to his cardiologist, Dr. Goodman, he finds out he has a clean bill of health. Of course, this is Alan, so he pretended that he might need a heart transplant. This obviously didn’t go well, and Zoey ends up catching him in the lie.

Source: Fox News
His real name is Jason Greenspan, but he adopted the stage name Jason Alexander while in high school in New Jersey. He appeared in Broadway plays and movies, then in the hit TV series, Seinfeld , from 1990 to 1998. Along with directing and producing films, he can be seen in the Cinderella movie starring Brandi. He plays the right-hand man to the prince.