Season 15: Revenge

MAin antagonist is Aspheera and The Pyro Snakes are the villains in the first half and Vex and the Blizzard Samurai are the Villains

Episodes
158. The Scroll of Super Spinjitzu

159. The Return of the fire

160. The Ultra Blade

161. Locked Up

162. Ninja Never Quit

163. Backup Ninja

164. The Elemental Masters return

165. The Snake is Aspheera

166. Burned Out

167. Freezed Out

168. Burn City

169. The Never-Ending

170. The Fire Returns

171. Ice-land

172. The Land of No Fire, Part I

173. The Land of No Fire, Part II

174. The Cold

175. The Land of Ice

176. Paperboy Ninjas

177. The Super-Freeze

178. The Cloud of Fire

Protagonist
Kai