For reasons unknown, R&B superstar and mentor to the Biebs, Usher, will be joining the cast of the Argentine-multi-sensory-anti-theater production, Fuerza Bruta, for two performances on April 28th. The singer, who previously starred in Chicago as Billy Flynn, will hop on a giant treadmill when he takes on the Running Man role that also opens the show. The performance will run at 7 pm and 10 pm at the Daryl Roth Theatre and you can purchase tickets -- at $150 a pop -- HERE.Daryl Roth Theatre, 101 E. 15th St., New York