Hikari Sentai Maskman Season 1 Strange! The Dark Underground Castle
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Commander Sugata discovered the existence of the Royal Underground Empire Tube, a malignant force that desires to dominate the land, which is based underneath Japan.
He recruits five young people, each one specializing in a style of martial arts, and teaches them in the ways of the mystical "Aura Power" energy.
A year after he recruited and trained the Maskmen, Tube is ready to strike.