Here's the back story of everyone who appeared in the new Nike 'Dream Crazy' ad featuring Colin...

On Wednesday, Nike released the extended version of its "Dream Crazy" ad. The two-minute video is narrated by Colin Kaepernick and features many athletes who have overcome odds to be where they are today.

The ad features the stories of 16 athletes with inspirational stories, ranging from Charlie Jabaley, an Ironman who completely change his life, to tennis legend Serena Williams.

The main theme is this: "Don't ask if your dreams are crazy. Ask if they're crazy enough."