The same seasons saw several Christmas episodes, while conservation and environmentalism were brought center stage. Some scripts dealt with race and ethnicity with both Jeff and Timmy championing Hispanics, Native Americans, and Asian Americans. Aging Americans were presented in a positive light during the years when Andy Clyde was featured as Martin family friend/neighbor Cully Wilson. Seasons 11–16 were the "Ranger years" of the series, as Lassie (because she was not able to go to Australia with the Martins when Paul got a job teaching agriculture there) was taken in by U.S. Forest Ranger Corey Stuart (who appeared in a few episodes of season 10) and began to work with the U.S. Forest Service. Color filming was exploited during the Ranger years with Lassie and her friends sent to exotic locations such as Sequoia National Forest and Monument Valley, creating miniature travelogues for viewers. Other rangers would be featured during the latter part of this era when Robert Bray (who played Stuart) left the series. For season 17, the program shifted gears again and became somewhat of an anthology series, with Lassie traveling on her own, getting into different adventures each week (similar in format to The Littlest Hobo). No explanation was given as to why Lassie was no longer with the Forest Service. Some episodes during this final CBS season were animals-only. During seasons 18 and 19 (with the series having moved to first run syndication), Lassie was taken in by Garth Holden (played by Ron Hayes) who was in charge of the Holden Ranch – a home for orphaned boys – which he ran with his college-age son and his friend. This (somewhat) brought the show back to its roots by giving Lassie a farm/ranch home base, which is where she settled in for the final two years of the series. Lassie themes explored the relationship between boys and their dogs with the show helping to shape the viewer's understanding of mid-twentieth century American boyhood. Lassie was associated with the wholesome family values of its period but some parents' groups monitoring television content found cliffhanger plots showing children in danger too intense for very young viewers and objected to some of Timmy's actions which were believed to encourage children to disobey parents. However, Lassie was consistently depicted as caring, nurturing, and responsible with a commitment to family and community, often rescuing those in peril and righting wrongs. She