The season focuses on the main ninja character Nya.It follows the storyline of her elemental powers being disrupted and how this is connected to an ancient mythical creature. The plot involves the ninja characters Jay, Zane, PIXAL, and Lloyd journeying deep beneath the sea to explore the mystery behind Nya’s elemental powers .The season introduces two antagonists named Miss Demeanor and Prince Kalmaar, with the latter being the season's main antagonist.It is dedicated to Kirby Morrow, the voice actor for the character Cole, who passed away prior to the season's premiere.