keith kogane, now leader of the blade of marmora , has been fighting the fire of purification for years since the paladins defeated honerva. he recently discovered the intent of the fire to kill off the paladins of voltron, one by one. they are the greatest weapon the galaxy has ever know, they don't know how, but this weapon the fire is building is large enough to wipe out the entire universe. now it's time to uphold their final destiny, one more time, to defend the universe.