NBC ‘s upcoming cheerleading comedy “ Stumble ” has added a trio of guest stars. Variety has learned exclusively that Jeff Hiller , Dascha Polanco , and Ashlie Atkinson are all set to appear in the series, which will debut on NBC on Nov. 7 and stream the next day on Peacock. The series is described as a “A mockumentary about the ridiculously high stakes competitive world of junior college cheer.” The cast includes series regulars Jenn Lyon, Taran Killam, Ryan Pinkston, Jarrett Austin Brown,