LEGO Ninjago: Masters of Spinjitzu

Cole asks Sensei Wu how Garmadon gained control over the Skeleton Army. Wu tells of how his dark brother was cast down into the Underworld after he tried to take the Weapons by force. There is then a flashback to when Garmadon arrives in the Underworld, swearing that he would have his revenge. The Skeletons find him and Samukai prepares to pay him back for previous defeats when Garmadon and Wu worked together. Garmadon proceeds to use his Spinjitzu to defeat Samukai and take over as supreme commander of the Skeleton Army.