Marc Lawrence pens the season five opener, aired on 25 September, 1986. There have been some changes in the Keaton family, Alex (Michael J. Fox) is a sophomore at Leland, Mallory (Justine Bateman) and Skippy (Marc Price) are freshmen at Grant, Jennifer (Tina Yothers) is in junior high, and Andrew (Brian Bonsall) who was a…