Ben 10: Omniverse (2012)
S7E2 Rook Tales
Episode Overview
Master Kundo, who once mentored Rook, is determined to protect Revonnahgander customs at all costs. He is set on stopping Rook's sister, Rook Sharr, from attending the Plumber Academy, fearing that it would hinder her path to becoming a Plumber and threaten their traditions.
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S7