Out of the original 80 episodes (8 seasons), roughly 52 episodes (5 seasons) were officially dubbed into Japanese.
The dub was handled by Toho Company, Ltd. and Tohokushinsha Film Corporation. ben 10 omniverse japanese dub verified
While Ben 10 is a Western cartoon, Omniverse had the most successful Japanese run. The art style of Omniverse (created by Derrick J. Wyatt, inspired by Japanese Gurren Lagann aesthetics) resonated deeply with Japanese audiences. In fact, the popularity led to a unique crossover: Out of the original 80 episodes (8 seasons),