“Back to the Future” film trilogy, reunited at this year’s New York Comic Con nearly 40 years after the sci-fi films were released.On Saturday, the two teamed up for a panel at the Javits Center event to talk about the saga, while fans grew teary-eyed watching the pair remember the good ol’ days.“The best part of the movie was working with Chris,” Fox, 61, said of 83-year-old Lloyd, recalling when they first met. Fox, calling him a “genius,” said there was “immediate chemistry” between them, referring to Lloyd as the “King of Exposition.”But reliving their sci-fi glory days onstage fell to the wayside for audiences online, who noticed Fox’s evident health decline.