"Sonic the Hedgehog 2" star Ben Schwartz talks about his big comedy break

"Sonic the Hedgehog 2" has become the highest grossing video game movie ever in the U.S., surpassing $150 million in the box office. The blue hedgehog is voiced by Emmy-winning writer, actor and comedian Ben Schwartz — who is sharing his road to stardom with CBS News.

Schwartz was 22 years old when he started working as a page for "The Late Show with David Letterman" at the Ed Sullivan Theater. He even pitched jokes for the monologue, becoming a freelance writer.

"I got 21 jokes on, which is huge," Schwartz said.