莱伯特（休•杰克曼 饰）是19世纪的一名落魄贵族公爵，在家人为他安排的相亲宴会上，他为了追踪一个陌生人，疯狂科学家斯图尔特，无意闯入时空隧道，来到了100多年后的21世纪，斯图尔特的意外住院使公爵面对陌生的环境举步维艰。机缘巧合下，他邂逅了斯图尔特的前女友凯特（梅格•瑞恩 饰）——一个野心勃勃、独立聪明的广告界女强人，一连串的事情，使二人互相吸引，谱写出一段跨越时空的浪漫恋曲...... 　　但是，穿越时空的情感注定不会一帆风顺。为了顺应历史的发展，出院的斯图尔特不得不把莱伯特送回属于他的年代，莱伯特和凯特刚刚开始的恋情面临时空分离的危机。两人是命定的缘分还是刹那的相逢？两人能否穿越时空的阻隔在一起？Kate and her actor brother live in N.Y. in the 21st Century. Her ex-boyfriend, Stuart, lives above her apartment. Stuart finds a space near the Brooklyn Bridge where there is a gap in time. He goes back to the 19th Century and takes pictures of the place. Leopold -- a man living in the 1870s -- is puzzled by Stuart's tiny camera, follows him back through the gap, and they both ended up in the present day. Leopold is clueless about his new surroundings. He gets help and insight from Charlie who thinks that Leopold is an actor who is always in character. Leopold is a highly intelligent man and tries his best to learn and even improve the modern conveniences that he encounters.