(THEATER) I haven't seen the production, but I've read the world-premiere script by local playwright Elizabeth Heffron, and it's subtler, lighter, and funnier than the title indicates. The play features a 22-year-old Army bride, an Esperanto club, and Thomas Aquinas, the Catholic saint and theologian, whose theory of "delayed ensoulment," once accepted as church doctrine, means a fetus isn't human until the second trimester. Whatever your right-to-life politics are, Mitzi's Abortion will complicate them. (Note: The Sunday, July 23, evening performance is pay what you can.) (ACT Theatre,700 Union Ave, 292-7676. 7:30 pm, $10–$54. Through Aug 20.)