Now Playing: Pop-Star 'Mangles' the 'Spangled' Banner

Now Playing: Kimmel: A Tale of Two Anthems

Now Playing: 'Black Anthem' Sparks Anger

Now Playing: Court upholds 'Making a Murderer' Brendan Dassey's overturned conviction

Now Playing: Hollywood Walk of Fame 2018 honorees revealed

Now Playing: 'The Keepers': How 2 women delve into the mystery of their teacher's killing

Now Playing: Inside Marvel: How the Darth Vader comic series fit into the greater Star Wars universe

Now Playing: Kate Mara on 'Megan Leavey' and her relationship with sister Rooney

Now Playing: Elijah Blake and Gina Belafonte on activism and music

Now Playing: Cosby publicist reveals plans for speaking engagements

Now Playing: Inside Marvel: Darth Vader comic series fills in the gaps between Episodes III and IV

Now Playing: Inside Marvel: Darth Vader comic introduces a new Jedi to the saga

Now Playing: Inside Marvel: Darth Vader comic explains why Sith lightsabers are red

Now Playing: Celeb 101 with 50 Cent

Now Playing: Judd Apatow reveals secrets about his family and career

Now Playing: Stars of Disney's 'Descendants 2' on new movie

Now Playing: 'GMA' Hot List: Josh Duhamel reveals the 1st words he said to wife Fergie

Now Playing: Rolling Stone Film and TV critic Peter Travers on Daniel Day Lewis' retirement

Now Playing: 'Handmaid's Tale' Ann Dowd on finding inspiration for her role

Now Playing: Veteran TV and film actor Ann Dowd on her career