Lego Ninjago: Masters of Spinjitzu Season 4 Episode 2 Only One Can Remain Episode Title:Only One Can Remain.Episode Description:After the ninja arrive at Chen's island, Garmadon tells them he used to train under Chen. When inside, Chen himself greets the Elemental Masters, and tells them about the Tournament of Elements and the Jade Blades. In the end, Karlof becomes the first Elemental Master to lose. While the ninja are searching for Zane, they accidentally stumble into a secret gathering of Chen and his cultists just in time to see Chen steal Karlof's powers.