I just picked up a copy of “Guys and Dolls” from the recent revival and noticed that at least 4 of the stars have had major success in TV and movie roles, and most people who would recognize them probably have no idea of their other talents and history.
Faith Prince (Paul’s wife Claudia on Spin City)
Peter Gallagher (currenly the dad on The OC, lots of roles)
Nathan Lane (lots of stuff)
JK Simmons (J Jonah Jameson in the Spiderman movies, Dr Skoda on L&O:SVU)
Of course many folks now know that Jerry Orbach was a Broadway star for years before gaining more public recognition on Law and Order and as Lumiere in Beauty and the Beast. Also John Cullum had a long Broadway career before gaining getting recognized as Holling Vincoeur on Northern Exposure.
So, who else out there that we recognize has or has had another career as a singer on Broadway before hitting it big in more mainstream pop culture? I think we can discount folks who had an established career before trying their hand on the stage, such as John Stamos or Neal Patrick Harris in Cabaret.