Master Raindrop

Friendship (1x17)

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The Elements encounter a mysterious cat who licks Niwa and takes her powers, turning her into a zombie that General Bu easily captures. When the others try to rescue Niwa, the cat turns Jinhou into a zombie, too, and takes his elemental powers. Raindrop and Shao Yen escape and literally bump into a Little Old Lady, who seems at first to be a hindrance, but turns out to be a vampire-cat hunter.