Provost left the show in 1964. A new story was developed that took Lassie off the farm. She became the friend of three Forest Rangers. They all had adventures in America's most beautiful natural areas such as Monument Valley and Alaska. In the early 1970s, new rulings about prime time were handed down by the Federal Communications Commission (FCC). These rulings meant that "Lassie" would be moved to the 8 pm time slot. "Lassie" had been shown for nineteen years in the 7 pm time slot. Producers felt that this move would not work for the show's child audience. The show was cancelled. Since the cancellation, "Lassie" has played in reruns and has never been off the air.