Return of the Kung Fu Dragon (1976)

Golden City, capital of wondrous Phoenix island, is attacked by an evil despot and his sorcerer ally and conquered, with the Emperor and his three generals killed by the invaders. The young princess and the three children of the generals are hidden away from the invaders with the hope that they one day will return to avenge the deaths of their fathers and reclaim the island paradise. Almost twenty years pass and the grown children do finally return to confront the despot and the sorcerer but, will they be successful?