Heathers, at New World Stages." width="600" height="750" style="width:100%;height:auto;" fetchPriority="high" > The Heathers of Heathers at New World Stages. Photo: Evan Zimmerman “I can’t promise no more Heathers,” Veronica Sawyer sings near the end of Heathers: The Musical . “High school may not ever end.” Those lyrics, delivered at New World Stages just over a decade after the show first brought its croquet mallets to midtown’s finest theater basement, come across as prophetic in a way that’