Rattla was another tribe member displeased with General Slithraa being under Lloyd Garmadon's control.
During the construction of Lloyd's treehouse, he was shocked by the fact that Skales had hypnotized one of the ninja and the general was not aware. After the conversation, he and Skales were repremanded by Slithraa for slacking off. As Skales and Slithraa conversed, Rattla left to assist in the construction.
During the face off between Slithraa and Skales, Rattla indentified the style Skales used to defeat the general was the ancient art of Fang Kwon Do.