Evil times three

Theatre on Fire is hot on the trail of casual evil when it opens its fifth season with “Bash.’’ Neil LaBute’s trio of one-act plays explores the dark hearts of ordinary people as they go about their day-to-day lives. “Medea Redux’’ deals with a woman’s teenage relationship with her English teacher. “A Gaggle of Saints’’ recounts two versions of the same violent trip to New York. In “Iphigenia in Orem,’’ a Utah businessman confesses to a crime. Pictured: Kate Donnelly. Tonight at 8. (Through Oct. 17). $15 (Thurs), $20 (Fri, Sat), $10 students and seniors. Charlestown Working Theater, 442 Bunker Hill St., Charlestown. 866-811-4111. www.charlestownworkingtheater.org