Chenoweth's 'Stumble' Role: A Showstopper?

NBC's 2025 fall television lineup welcomes "Stumble," a new cheerleading mockumentary starring Jenn Lyon as determined coach Courteney and Taran Killam as her husband Boon. The series centers on a developing cheer squad, navigating internal dysfunctions while facing external competition. A key addition to the cast is Kristin Chenoweth, who embodies the rival coach Tammy Istiny. Showrunners confirmed Chenoweth was the sole actor for whom a character was specifically written, highlighting her integral role. Tammy, portrayed with effervescent energy, claims a past friendship with Courteney from their college coaching days. However, she now leads the primary rival squad, setting the stage for dramatic confrontations. The Astrof siblings, who developed "Stumble," emphasized Chenoweth's unique contribution, stating the show would not exist without her. Chenoweth's role is recurring, but she is expected to be featured prominently throughout the season. "Stumble" airs Fridays on NBC at 8:30 p.m. ET, with next-day streaming available on Peacock. The show returned after a winter hiatus on January 16, 2026, following "Happy's Place." Early episodes have already established a developing rivalry between Courteney and Tammy, particularly after an accidental recruitment of rival team members.