I recently read all 144 pages of this graphic novel to my three-year-old daughter, and she loved it (even though some of it is over her head):

Susan K. Leigh. Luther: The Graphic Novel; Echoes of the Hammer. Illustrated by Dave Hill. St. Louis: Concordia, 2011.

This 32-page sample PDF illustrates the book’s format and style.

The story has five parts:

1. Luther’s Early Years
2. Luther the Heretic
3. Luther the Outlaw
4. Martin and Katie
5. The Reformation Continues

It’s published by Concordia Publishing House, the publisher of The Lutheran Church—Missouri Synod, so I’m guessing they know something about Luther.

http://www.youtube.com/watch?v=s5OtMaoHk-Q&feature=player_embedded

Related: My wife and I reviewed this book in 2008:

Paul L. Maier. Martin Luther: A Man Who Changed the World. Illustrated by Greg Copeland. Saint Louis: Concordia, 2004. 32 pp.