Mainstream movies can best be defined as movies created for profit that have a wide release and play in first run theaters ( a movie theater that runs mostly mainstream movies from the major movie companies and distributors , during the initial release period of each movie ) . Mainstream films can best be defined as commercial films that have a wide release and play in first run theaters ( A movie theater that runs primarily mainstream film fare from the major film companies and distributors , during the initial release period of each film ) .