http://www.pcgamer.com/a-new-overwatch-cinematic-reveals-the-tragic-origin-story-of-reinhardt/

A new Overwatch cinematic debuted today at BlizzCon, this one telling the origin story of Reinhardt—a sad tale of friendship, teamwork, and honor. 

As we've come to expect, this is another outstanding cinematic that expands upon the stories around the characters that make the Overwatch backstory so interesting. Young Reinhardt was arrogant, flashy, and impetuous—and not originally chosen to join Overwatch. Circumstances changed all that, and made him into the warrior he is now: One who hears the call, and answers. Always.