Overview: A large section of the north pole has vanished, and the Sentinels are dispatched to investigate.
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First Air Date: Sep 10, 1977Last Air date: Dec 03, 1977Season: 1 SeasonEpisode: 13 EpisodeRuntime: 22 minutesQuality: HDIMDb: 8.00 / 10 by 2 usersPopularity: 3.313Language: English