For kids of the ’60s, it was a thrilling weekly ride and for adults revisiting it later, it became a time capsule of an era when television dared to mix earnest family drama with outlandish spectacle.

June Lockhart, who became the archetypal TV mom of the 1950s and 1960s with her roles on the campy sci-fi series “Lost in Space” and alongside a collie and a little boy on the family drama “Lassie,” ...