Spoilers of the Plains

 Spoilers of the Plains  is a 1951 American Western film directed by William Witney, and starring Roy Rogers and Penny Edwards, with Foy Willing and the Riders of the Purple Sage. The film was distributed by Republic Pictures.

Cast

 * Roy Rogers as Roy Rogers
 * Trigger as Trigger
 * Penny Edwards as Frankie Manning
 * Gordon Jones as Splinters Fedders
 * Grant Withers as Gregory Camwell
 * Don Haggerty as Henchman Ben Rix
 * Fred Kohler, Jr. as Henchman Brooks
 * House Peters, Jr. as Henchman Scheller
 * George Meeker as Scientist Jim
 * Keith Richards as Guard Travis
 * Foy Willing as Singer and Oil Co. Worker Scheller
 * Riders of the Purple Sage as Singers and Oil Co. Workers

"Happy Trails" song
In 1951, Willing had written a song titled "Happy Trails" for the movie. Subsequently, the first three notes of his song and its title were used by Dale Evans in writing her version of "Happy Trails" for both the original The Roy Rogers Show and the short-lived The Roy Rogers and Dale Evans Show, which aired on ABC in 1962. Dale's is the version that is popularly played and sung today, albeit without giving credit to Willing.