Mister Fantastic (Reed Richards) is a fictional superhero appearing in American comic books published by Marvel Comics. The character is a founding member of the Fantastic Four. Richards possesses a mastery of mechanical, aerospace and electrical engineering, chemistry, all levels of physics, and human and alien biology. BusinessWeek listed Mr. Fantastic as one of the top ten most intelligent fictional characters in American comics. He is the inventor of the spacecraft that was bombarded by cosmic radiation on its maiden voyage, granting the Fantastic Four their powers. Richards gained the ability to stretch his body into any shape he desires.
Source: Wikipedia, "Mister Fantastic", available under the CC-BY-SA License.