Lloyd and Harumi sailed down the Black River on their way to the Oni Temple in a small boat, only to come across Crabby, a giant crab, who attacked the boat. Crabby ran away and Lloyd and Harumi went down the fast rapids of the river and fell down a waterfall, arriving at the Oni Temple.
The Sons of Garmadon parked the Destiny's Bounty on the river where they held the ninja captive while waiting for Harumi to exit the Oni Temple with the Oni Mask of Hatred. The ninja broke free of their captivity and negotiate with the Sons of Garmadon to return the mask and Lloyd flies out of the river and is caught by Jay. Crabby appears out of the water and chases both the ninja and the Sons of Garmadon onto a small island. Both groups attempt at fighting Crabby before the Sons of Garmadon leave with the Destiny's Bounty. Zane used his Ice powers to freeze Crabby into the river, but after Lloyd escapes onto the Bounty, the ice breaks and Crabby is free.