A Life,' spoke on a Jan. 3 episode of NPR’s 'Book of the Day' podcast about Martin Luther King Jr., and noted that MLK didn’t have plans to become a civil rights leader when he joined the Montgomery Bus boycott in 1965.

Every year we honor the legacy of Martin Luther King Jr. in January. Here's everything you need to know about the holiday.

Originally released on home video, Dr. Martin Luther King Jr.: A Historical Perspective follows a more traditional approach to documentary filmmaking. Narrated by The Transformers voice actor Arthur Burghardt, we see some never-before-scene footage of Dr. King and elements of his life that weren’t covered in the previous documentaries.