《九头蛇》讲述了青年科学家白敬天为寻找杀人的九头蛇，带领一群人进入茫茫大山，本以为只是一次寻常科考，岂料一重一重的危险接踵而至——“鬼影”挡路、怪兽肆虐、人心叵测，白敬天以及同伴一次又一次陷入绝境，而在绝境之中更有无数的谜团笼罩——无故失踪的激素、死而复生的同伴……密林之中，求救无门，谁是敌？谁是友？信错一次，便可能葬身怪兽之口……

Young scientist Bai Jingtian leads a group of people into the vast mountains in search of a murderous hydra. He thought it was just an ordinary scientific expedition. Unexpectedly, many dangers will follow one after another.