The musical adaptation of the franchise about a teenager who discovers he’s the son of Poseidon hits the Great White Way on September 20 ahead of an October 16 opening night. It comes on the heels of an extensive, nationwide tour that took the show to 32 cities. The original Off-Broadway production of “The Lightning Thief: The Percy Jackson Musical” debuted in spring 2017 at the Lucille Lortel Theaterin New York City. It also launched its tour in Chicago in January.