ImprovBoston Mainstage is the cornerstone of comedic talent at ImprovBoston. Showcasing our Freeform style of play, an ever-evolving show, Mainstage is the heart of ImprovBoston. Blending games, scenes, skillful storytelling, memorable music and audience participation, an elite cast of Boston's best improvisers creates a show that redefines itself with every performance. No rules. No boundaries. Just spectacular comedy and incredible improvisation.