After an encounter with Dalong Wong, Valmont is turned into a child. He seeks Jackie's help. The Chans head to England to find the horse with a talisman magic. Jade casts a spell on herself.
Uncle's old opera troupe is in town, which leads to a reunion with an old friend. Jackie finds that someone may be using some Stage tricks to commit crimes.
Surveillance footage suggests Viper has returned to her old ways. But the J Team soon discovers, there's a duplicate. Someone is out to replace/destroy the J Team.
Jackie recovers the latest Oni mask before the Dark Hand can get to it. El Toro and Paco visit for Halloween, but they're not told about the dangers of Oni masks.
The Chans and the Dark Hand try to buy an Oni mask offered on an online auction. Neither wins, the winning bidder is familiar to both sides. The mask is split during a fight. Each side possess half a mask, but the mask does not want to be separated.
The card with the mask removal ingredient is lost. Hak Foo ends up with the Oni mask, and summons his shadowkhan, a tiny army that feeds on human shadows.