Jackie Chan Adventures (2000) : 4x7

Jackie and the enforcers locate the seventh oni mask at a yard sale where it is eventually bought by a man who owns a site the sales antiques. It is then sold and won by some rich guy who ends up being Valmont. Jackie and the enforcers go to Valmont's apartment to get the mask and there is a big fight. During the fight, the mask is broken in half by Hak-Foo and one half goes to Valmont and the other is caught by jade. Valmont puts on his half and summons half of the shadowkahn. Jade puts on the other half and summons the other half, which don't have heads). They end up in a building where the two halves of the maske get together and combine the shadowkahn into one so that they can defeat Jackie. While this is happening, Jade and Valmont are trying to get the half masks off themelves because Valmont wants money and the mask wants power. Eventually they get the mask removal potion and take the halves off each other.