A man foils an attempted murder, then flees the crew of would-be killers along with their intended target as a woman he's just met tries to find him....

《小医生》是依据迪特里希·格吕纳麦耶教授（Dietrich Gr?nemeyer）的同名儿童读物改编，讲述了小医生的探险之旅。纳诺姐弟自幼失去父母，是爷爷奶奶带他们长大。爷爷山迪是园艺工人，在斯诺特教授实验室工作。斯诺特教授运用剽窃的缩微技术，可以将机器人缩小到纳米级别，植入人体后可以控制人类大脑。他借为山迪医治腰伤机会，将机器人植入山迪体内。恰好被来找爷爷的纳诺撞见......纳诺的同学莉莉请求...