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Michael J. Fox is sharing details about the early days of his career and how challenging it was to balance playing two iconic characters.

In his new memoir, "Future Boy," the actor opened up about the difficulties of balancing the filming of the third season of his hit sitcom, "Family Ties," with 1985's "Back to the Future."

"Time definitely went rogue in the late winter and early spring of 1985, and took me with it," he wrote. "During three long months, I was Alex, I was Marty, and I was Mike. That’s two too many. In order to complete my work, at least one of them had to go, and Mike was the odd man out."

He later added, "I was Alex P. Keaton during the day, and Marty McFly at night. The twenty-hour workdays left little t

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