. "Propane Boom is the thirty-fifth episode of King of the Hill. It was first aired on May 17, 1998. The episode was written by Norm Hiscock, and directed by Gary McCarver."@en . "23"^^ . . "Propane Boom is the thirty-fifth episode of King of the Hill. It was first aired on May 17, 1998. The episode was written by Norm Hiscock, and directed by Gary McCarver."@en . . "1998-05-17"^^ . . . "2"^^ . "Propane Boom"@en . . . . . . .