They were eventually joined by Mary Steenburgen, Elizabeth Shue, singer/songwriter Huey Lewis and composer Alan Silvestri.
A “Back to the Future” superfan J.J. Abrams connected for a quick trivia game with the cast.
Lewis spoke about the hit song “Power of Love” from the “Back to the Future” soundtrack and how he had never written a song for a movie.
Zemeckis also showed off some of the props from the film series that he owns -- the iconic hoverboard from “Back to the Future 2” and the auto-lace shoes from the same film. They also did a table read of some of the scenes.
The ended the interview with a performance of "Power of Love" by the cast of the upcoming "Back to the Future" Broadway show.
Gad is using "Reunited Apart" as a fundraiser. The "Back to the Future" episode will benefit Project HOPE which will provide protective equipment and train healthcare workers in high-risk areas.
Gad's first show reunited the cast of "The Goonies" last month. That episode raised more than $30,000 for The Center for Disaster Philanthropy.
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