Nike has unveiled its first "Just Do It'' ad narrated by Colin Kaepernick, a spot scheduled to air during the NFL season opener Thursday night as well as during the U.S. Open tennis tournament and other major sporting events. The two-minute spot released Wednesday highlights superstar athletes LeBron James, Serena Williams and others, and touches on the controversy of NFL players protesting racial inequality, police brutality and other issues by demonstrating during the national anthem. Kaepernick narrates the full spot but first physically appears midway through. As a camera pans to reveal Kaepernick's face, a reflection of a United States flag is visible on the facade of a building behind him. Kaepernick says: Believe in something, even if it means sacrificing everything.''