马丁·劳伦斯扮演一位穷困潦倒的拳击手,在某中世纪主题公园里当招待维生,不料有一天被意外击昏,醒来后却发现自己来到了中世纪,接着被一心想谋杀皇后的邪恶国王当成异类关进大牢,冒险逃出后误入丛林,被一名落难骑士当成是上天派来帮助他们推翻暴政的使者,于是被迫练习剑术,又引来一名美丽的农家女垂青,他们合力对抗邪恶的国王,马丁也重新认识了幸福的真谛……This is the story an amusement park employee named Jamal Walker who is magically transported back to medieval times in 14th-century England. There, Jamal meets Sir Knolte, a dissolute knight, before he stumbles into the court of the usurper King Leo. Jamal is impressed by what he thinks is the realism of the theme park; only after witnessing a gory beheading does he realize, with horror, where he really is. Jamal encounters the beautiful Victoria who is scheming to return the queen to the throne, and falls afoul of the evil Sir Percival. Joining forces with Sir Knolte and Victoria, Jamal teaches the rebels some helpful football, golfing, and boxing moves, before he dons the armor of the awesome "Black Knight"!