Jim Parsons has nailed down his next legit gig, toplining an upcoming Broadway revival of "Harvey."
The "Big Bang Theory" star, who made his Main Stem bow last season in the revival of "The Normal Heart," will appear in a Roundabout Theater Company production helmed by Scott Ellis, the associate a.d. of the Gotham nonprofit.
Parsons will play the man who pals around with a giant invisible rabbit in the 1944 play by Mary Chase. The cast also will include
Jessica Hecht and Charles …