《时间之箭》讲述了：十二岁男孩木里，刚小学毕业，在和妈妈一起的暑期旅游中他意外失踪了。在自然博物馆里，一艘橡皮艇带着他偶然进入到了原始的白垩纪时代！ 在到处都是恐龙的丛林里，木里跌伤了腿，被1944年神秘失踪的恐龙考古学家桑吟救起。渐渐适应那里的生活后，木里甚至有了自己的宠物恐龙，也知道了桑吟和时间之箭的秘密，原始森林里的生活也不赖，直到有一天他亲眼见证了恐龙的灭绝......
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