Martin Lawrence plays Jamal, an employee in Medieval World amusement park. After sustaining a blow to the head, he awakens to find himself in 14th century England.

An anorexic young woman escapes from a psychiatric clinic and meets a young man who wants to help. She is caught and returned to her parents, who are soon beheaded by a garrotting stranger making the rounds about town, apparently striking only when it rains. The orphaned young woman and her new lover launch their own investigation and are endangered when a link is discovered with the victims and a particular operation performed years before.

For decades, next-door neighbors and former friends John and Max have feuded, trading insults and wicked pranks. When an attractive widow moves in nearby, their bad blood erupts into a high-stakes rivalry full of naughty jokes and adolescent hijinks. Will this love triangle destroy the two old grumps? Or will the geriatric odd couple overcome their differences and rediscover their friendship?