>>> LISTEN TO THAT MUSIC. NOW TO THE ICONIC '80s MOVIE COMING RIGHT HERE TO BROADWAY. "BACK TO THE FUTURE," THE MUSICAL BEGINS JUNE 30th. THE CO-CREATOR OF THE FILM AND THE BOOK WRITER, MR. BOB GALE, WELCOME TO "GOOD MORNING AMERICA." WE ARE SO HAPPY TO HAVE YOU. THANK YOU FOR BRINGING US THAT JOYFUL STORY. >> THANK YOU, THANK YOU, LARA. I'M REALLY HAPPY TO BE HERE. >> I LIKE YOUR RIDE TOO. BOB COMES IN STYLE, EVERYBODY. YOU'RE NOT JOKING AROUND. >> YOU KNOW, I'M NEVER LATE WHEN I'M IN THIS, RIGHT? >> LET ME ASK YOU A HYPOTHETICAL. IF YOU COULD POP INTO THE DeLOREAN, GO BACK IN TIME TO YOUR YOUNG SELF MAKING THAT ICONIC MOVIE, WHAT WOULD YOU SAY TO YOURSELF ABOUT THE JOURNEY AND ABOUT THE IMPACT THAT IT'S HAD ON POP CULTURE? >> I WOULD TELL MY YOUNGER SELF, BOB, YOU'RE NOT GOING TO BELIEVE THIS BUT 40 YEARS FROM NOW YOU'RE GOING TO BE STANDING ON BROADWAY AND THIS IS GOING TO BE A MUSICAL AND MY YOUNGER SELF WOULD SAY, GET THE HELL OUT OF HERE, OLD MAN, WHATEVER YOU'RE DRINKING, I WANT SOME. >> I LOVE IT. NOW YOU'RE NOT JUST HERE TO SHOW ME YOUR COOL CAR BUT HERE WITH A SPECIAL ANNOUNCEMENT. >> I AM. THERE'S BEEN A LOT OF SPECULATION ABOUT THIS. WHO IS GOING TO PLAY MARTY McFLY. >> YOU'LL SHARE WITH US. >> I'LL SHARE WITH YOU RIGHT NOW, BECAUSE I'M HERE, CASEY LIKES. >> GET OUT OF HERE, CASEY LIKES, EVERYBODY. MARTY McFLY IN THE HOUSE. >> WHAT'S UP, MAN? >> HI. GOOD TO SEE YOU. >> YOU RECOGNIZE HIM, HE WAS JUST ON "GMA" FOR "ALMOST FAMOUS" ON BROADWAY. YOU'RE A BUSY GUY. >> I'M VERY, VERY LUCKY AND HONORED TO JUST WORK WITH AMAZING PEOPLE LIKE HIM. I'M REALLY HAPPY TO BE HERE. >> DID YOU WATCH THE MOVIE AS A KID? I MEAN, IT MUST BE A PINCH YOURSELF MOMENT TO BE PLAYING SUCH AN ICONIC CHARACTER. >> IT'S AN HONOR. MICHAEL J. FOX IS SERIOUSLY A HERO OF MINE AND MY MOM ALWAYS SAID I REMINDED HER OF HIM WHEN I WAS GROWING UP. >> ISN'T THAT FUNNY? >> SO CRAZY. AND IT'S JUST AMAZING HOW TIMING WORKED OUT. AND I WAS ABLE TO BE A PART OF THIS AND I'M JUST HONORED. SO THANK YOU, BOB. THANK YOU. >> YOU EARNED IT, CASEY. YOU EARNED IT. >> I CAN'T WAIT TO SEE YOU, FANTASTIC SINGING SONGS FROM "ALMOST FAMOUS." I KNOW YOU'LL BRING IT. BOB, THANK YOU FOR TRANSLATING IT TO BROADWAY. WE LOVE IT BECAUSE WE ARE RIGHT HERE. >> YOU'LL LOVE IT EVEN MORE WHEN YOU SEE IT. >> I KNOW. IT'S DONE GREAT IN LONDON. COMING HERE. PERFORMANCES BEGIN JUNE 30th AT BROADWAY'S WINTER