An arrangement was then made to bring Fox aboard even as he continued to filmFamily Ties.
It was very unusual because Christopher is a theatrically trained actor, explains Gale.
He knew every line of the script on the first day of shooting.

Ralph Nelson/Universal
Foxs last-minute line-learning also worked its way into the final film.
Michael would throw Chris for a loop by saying something that wasnt originally in the script, recalls Gale.
Chris was such a good actor that he just went with it and made something out of it.
These guys became great friends.
Still are great friends.
Video courtesy of Universal Pictures Home Entertainment.