With the grand opening of the Fenway Wahlburgers location, new investor Bob challenges the local Boston rival “Tasty Burger” to a game of softball at Fenway Park. All the Wahlberg brothers show up and do battle on the legendary diamond of the Boston Red Sox. Alma volunteers to manage the team, but ultra-competitive Mark decides to run things instead. Will Donnie show up to the game on time and help Team Wahlburgers win?