It's look as though one of Jim's old classmates from his theatre days, may appear on the show. Craig Welzbacher posted on his instagram that he was working with Jim.
Craig is the co-founding the critically acclaimed "Immediate Theatre Company" and graduated from the University of Washington's School of Drama. He has appeared in shows such as Modern Family, NCIS, SCI, iCarly and a recurring role in the sitcom Twins. Craig had a starring role in the feature film "Playing House" shot in his home town of Houston Texas is 2010.
There is no information about which episode this might be yet but we'll keep you posted.