American Ninja Warrior The extreme obstacle-course competition kicks off a new season with a qualifying round in L.A.; Matt Iseman and Akbar Gbajabiamila host. 8 p.m. NBC
500 Questions This tough trivia challenge hosted by “Nightline’s” Dan Harris wraps its second season. 8 p.m. ABC
MasterChef The culinary competition hosted by chef Gordon Ramsay is back for a seventh season. 8 p.m. Fox
Young & Hungry Heartbroken Gabi (Emily Osment) heads for Hawaii in the sitcom’s season premiere; Jonathan Sadowski, Kym Whitley and Rex Lee also star. 8 p.m....