Lassie (1954)

Season 14: Episode 17

Corey escorts Miss Ridgeway, a nature painter of renown, to a secluded area where she can work, leaving Lassie with her for company. When her insulin supply is destroyed after a lightning strike sets her cabin afire while she is away painting, Lassie must help get her back to the ranger station over a treacherous bridge before she goes into a diabetic coma.