"Cornball!" is the first segment of the sixty-sixth episode of Star vs. the Forces of Evil. It premiered on April 7, 2019 alongside "Meteora's Lesson", and is the first segment of the tenth episode in the fourth season.
Star invites Buff Frog and his kids to attend a game of Cornball, hoping its players of both Mewmans and monsters can put aside their prejudice and properly integrate into the sport together. Buff Frog is not thrilled by this and finds out that Star only invited him as a way to have him return to Mewni. Star tries her best to have both sides play together as mixed teams, but it only escalates into a fight with spectators joining in as well. Unsatisfied, Buff Frog decides to leave along with his kids but then notices from behind the bleachers that his own kids as well as Mewman and monster children are having fun playing their own game of Cornball. Game announcers Marco and Kelly take notice of this, which alerts the attention of all the adults and begin to feel at ease seeing their children play together. Star and Buff Frog realize there may still be hope into proper integration.
- June 14, 2019 (Southeast Asia)