 In order to protect the All-American perception of the show and its sponsor, Campbell's Soup, the producers wrote long clauses into cast contracts forbidding them from appearing in anything that would damage their wholesome image.In 1963, the multi-part episode "The Journey" was filmed in the High Sierra and later edited into a feature film called "Lassie's Great Adventure".The plot follows Timmy and Lassie as they are swept away in a carnival hot air balloon.