"Second Foundation" is about the Mule's search for the Second Foundation, which has been tucked away in a hard-to-find part of the galaxy. As the Mule comes closer to finding it, the mysterious Second Foundation comes out of hiding to face him. It is a collection of the most intelligent humans in the galaxy. Using its strongest minds, the Second Foundation wears down the Mule. His destructive attitude is adjusted to a benevolent one. He returns to rule over his kingdom peacefully for the rest of his life, without any further thought of conquering the Second Foundation.