Following a massive heart attack, Randal enlists his friends and fellow clerks Dante, Elias, Jay, and Silent Bob to make a movie immortalizing his life at the convenience store that started it all. “Clerks III” stars Brian O’Halloran, Jeff Anderson, Trevor Fehrman, Austin Zajur, Jason Mewes, Marilyn Ghigliotti, Rosario Dawson, and Kevin Smith.…