相傳黑暗之門內，蘊涵著無窮的邪惡能量。只要有人鑄造出黑龍劍，就可以打開黑暗之門，吸取黑暗之門內的邪惡能量。 靈山洞主知道這一消息後，陰謀奪得黑龍劍的鑄造秘籍，秘密鑄造黑龍劍。 黑龍劍出世了！ 以虹貓為首的七俠這才明白，一個陰謀已經籠罩森林大地。要想阻止靈山洞主的陰謀，阻止黑暗門打開，依照祖訓，唯一的辦法是：在七七四十九天之內，到祭劍山與光明劍的鑄劍人會合。由他與虹貓一起破解長虹劍上隱藏的密碼，找到鑄造玉龍劍的七樣必不可少的寶物，最後鑄造出光明劍。 經過一番周折，七俠找到了光明劍的鑄造人——莫將，面對靈山洞主陰謀阻止，眾人齊心協力，就在靈山洞主藉助星光，完成對黑龍劍第七次淬火、欲打開黑暗門之時，七柄寶劍投入火爐，光明劍出，虹貓手執光明劍，粉碎了黑龍劍，阻止了黑暗門的打開，森林大地的一場危機再次被虹貓等七俠化解……
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