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The Stranger that Cometh
Ashley is sleeping out in the family's fort in the woods when she senses an intruder and sounds the foghorn. Brent Sr. and Michael get her safely out, but for the first time, the family is facing a threat from an unknown entity — something they expect much more of in the future. Brent Sr. tasks Michael and Dawn-Marie with developing a multi-level perimeter defense system to deter enemies from getting too close to the castle.

Source: National Geographic Channel