Curious Theatre Company’s ambitious serial storytelling series, which began with Tarell Alvin McCraney’s powerful trio of Brother/Sister Plays, will sail into the completion of its second cycle — The Elliot Trilogy, by Quiara Alegría Hudes — to start off 2017. The final Elliot play, The Happiest Song Plays Last, opens for two nights of previews starting at 8 p.m. Thursday, January 12, at Curious, 1080 Acoma Street. Song brings to a close three chapters in the story of the recurring character Elliot, who starts out as a young Puerto Rican soldier from north Philly fighting overseas in the first installment and ends up reenacting his wartime experience as an actor for a film being made in Jordan in the last. Curious will punch up The Happiest Song, a play that works alone or as part of the trilogy, with live Puerto Rican and Middle Eastern music. The production runs through February 18; for information and tickets, $18 to $50, visit curioustheatre.org.