From the Super Mario Wiki
Winged Traitors is the fourth level of the Minion Quest: The Search for Bowser mode of Mario & Luigi: Superstar Saga + Bowser's Minions.
Captain Goomba and his growing squad encounter a pair of Paragoombas standing around for no reason. He tries to recruit them, but they take him for an enemy and attack him. However, he and his squad are victorious, and Captain Goomba confronts the Paragoombas, demanding to know what happened to Bowser. They tell him that Fawful has him, and when they tried to stop him, he brainwashed them with his headgear smoke, saying that no one should get their face in it.