By Olivia Kemp, CNN

(CNN) — The original cast of “Back to the Future” has reunited – not for a reboot, but to help locate a piece of movie history that went missing about 40 years ago.

A hunt is underway for the cherry red Gibson ES-345 guitar, which was played by Michael J. Fox in the 1985 movie as part of the pivotal “Enchantment Under the Sea” school dance scene.

Filmmakers tried to locate the instrument during production of the 1989 sequel, but they were unsuccessful.

In a video released by guitar company Gibson on Tuesday, Fox, Christopher Lloyd, Lea Thompson and Harry Waters Jr., made a plea to fans and collectors to help them track down the instrument.

“It’s somewhere lost in the space-time continuum,” said Fox. “We need that guitar.”

Lloyd, channeling his character Doc B

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