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

Martin Luther King Jr., a reverend and civil-rights activist, was assassinated at 39. However, he inspired several movements and political changes.

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.