During childhood, Fred Claus suffered his younger brother Nick's saintliness. Jump ahead: Fred is a fast-talking, genial but self-centered guy in Chicago looking for $50,000 to open an off-track-betting shop. When one scam goes awry, he calls Nick at the North Pole for a loan: Nick will give him the money only if Fred comes up to help a few days with the Christmas rush. After his girlfriend dumps him, Fred heads north. Santa's facing an audit from an efficiency expert, and it's not pleasant. Fred's job is to review charts and determine who's naughty and who's nice. Is there any fraternal feeling left, can either learn from the other, and what about Santa getting fired? 世界上没有坏孩子。Made believe “Christmasy”。北极有圣诞老人。圣诞快乐。 居住在美国芝加哥的弗雷德·克劳斯（Vince Vaughn 饰）是一个滔滔不绝甚至有些自大的家伙，更令人想不到的是，他还有一个名叫尼克（Paul Giamatti 饰）的兄弟，竟然是现役的圣诞老人。两兄弟从小性格迥异，与善良的弟弟不同，弗雷德自私冷酷。在圣诞节前夕，他准备开设一家赌场，但是仍有5万美元资金没有到位。在这关键时刻，弗雷德被小矮人威利（John Michael Higgins 饰）带到北极。由于圣诞期间过于繁忙，圣诞老人和他的伙伴们忙得不可开交，因此请来弗雷德帮忙准备圣诞礼物。看在钱的份上，弗雷德答应了弟弟的请求。 与此同时，主管圣诞节等重大节日的官员莅临北极。他对这些节日导致的赤字颇为不满，因此决定将圣诞礼物配送的工作。
