Kai, Jay, Cole and Zane must master their elemental powers and Spinjitzu weapons to protect the land of Ninjago, which also has an underworld. Jillian Michaels, Brent Miller, Michael Adamthwaite, Kelly Metzger, Ian James Corlett, John Novak, Mark Oliver, Vincent Tong, Michael Kopsa, Kirby Morrow, Brian Drummond, Paul Dobson Added on Netflix 2015-04-14.