Michael J. Fox thanked Crispin Glover for being a "brilliant actor" to work with on Back to the Future 40 years after the film's release.
The 64-year-old actor recently wrote a letter to Crispin, 61, commending his "phenomenal role" of George McFly - the dad of Michael's alter ego Marty McFly - because he did not have time to say it when they shot the 1985 sci-fi comedy.