Marty McFly's red guitar from the original "Back to the Future" is missing and the movie's cast and filmmakers are asking for the public's help.

Great Scott! The search is on to find the guitar Marty McFly played to a crowd of '50s-era high school students at the Enchantment Under the Sea Dance back in Back to the Future, which celebrates its 40th anniversary this summer.

For four decades, a crucial piece of cinematic history has been missing. It’s the iconic cherry red Gibson ES-345 that Marty McFly shredded during the legendary Enchantment Under the Sea dance scene in Back to the Future—an electrifying moment that sparked a generation of guitarists and cemented the instrument’s place in pop culture.