9歳のシェルドン・クーパーは、IQ187の超・天才。彼とは真逆に育った兄のジョージ-とおませな双子の妹のミッシー、優しい両親とバアバの6人で騒がしくも平和に暮らしている。ある日飛び級に飛び級を重ね高校に入学することになったシェルドンは・・・。

A father turned clumsy kidnapper and a genius child get tangled in unexpected circumstances.

The series follows Vinnie Bassett, proprietor of a pop culture memorabilia store who only takes breaks to read comic books and play video games. His bachelor life comes to a halt when he assumes guardianship of his incredibly intelligent and mature nephew, Wendell. They soon find that 12-year-old Wendell may be just the parent Vinnie needs.