Bakugan Battle Brawlers Episode 39 - Masquerade Unmasked

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Masquerade battles Dan, though he ends up losing. After the battle is over, Masquerade takes off his mask, and the Brawlers find out he is Alice. Suddenly, Hal-G appears (as a holographic projection) and explains how he and Alice, became their alter-egos after being exposed to the negative energy from the Silent Core once Naga tried getting it.

source : Wikipedia

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