Season 25: Sacrifice

So it is all the previous villains vs the Ninja. They do the tornado of creation against the villains and they all die, but the Ninja die too.

Episodes
265: Awaken

266: Second thoughts

267: Breakout

268: High Flight

269: The Ultimate Power

270: Far Away from home

271: The Bribe

272: Taken

273:The Rescue Mission

274: Update

275: Back In Time

276: The Shock Heard Around Ninjago

277: Takeover

278: The Shadow Blades

279: The Blades destructed

280: Tornado of Creation