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Laura (Melissa Gilbert) and Mary (Melissa Sue Anderson) are outraged when their little sister, Carrie (played by twin actresses Lindsay and Sidney Greenbush), lets loose a collection of bugs that the girls have been gathering for a classroom project. But their anger gives way to terror when, while chasing a pretty butterfly, Carrie falls into an abandoned mine shaft. Worse still: The only person truly capable of rescuing the girl is Mr. Laudy (John Ireland), a former miner who has degenerated into a drunken derelict. Though some sources indicate that this episode was telecast on January 10, 1977, the official TV listings of the period indicate that it was actually shown earlier, on October 17, 1976.