THE VIRGINIAN: THE CHALLENGE (1966, USA) *** Western net. National Broadcasting Company (NBC); pr co. Universal Television; d. Don McDougall; w. Joy Dexter, Harry Kronman (based on a story by Joy Dexter); exec pr. Frank Price; pr. Joel Rogosin; ph. Enzo A. Martinelli (Technicolor. 35mm. Spherical. 1.33:1); m. Jack Hayes, Leo Shuken; m sup. Stanley…