突发奇想，聪明吴他们到郊外寻找地下王国。不成想，在一个山洞中，发现了一个巨蛇的蜡像。原来，巨蛇蜡像的后面，隐藏着一个通往地下王国的通道。聪明吴他们这一次的历险也自此开始。绿色的皮肤，没有表情的脸，聪明吴他们终于如愿以偿的见到了地底矮人。可是，这些矮人却并不友好。聪明吴他们被锁进铁笼子，逃脱之后再次被抓。这时聪明吴他们才知道，原来所谓的地底人，是一群专职偷盗的小偷。真相大白，可是聪明吴他们却陷入迷宫。
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