We could all use some joy right now, and the stars of One Chicago are here to deliver. Chicago Fire,'s David Eigenberg, Kara Killmer and Miranda Rae Mayo; Chicago Med's Nick Gehlfuss, Dominic Rains and Brian Tee; and Chicago P.D.'s Jason Beghe, LaRoyce Hawkins and Tracy Spiridakos gathered via a video chat to test their knowledge of the Windy City whole raising money for charity. Funds, accumulated through correct answers, benefit the Greater Chicago Food Depository.