Thompson portrays the aforementioned Maggie McFly, the great-great-grandmother of Marty and the great-grandmother of George... Regarding another character, Thompson appears in Back to the Future ...

Any newly-filmed scenes of George McFly could have easily been cut without ... the McFlys falling apart in 1985 - but Crispin Glover's character takes a more central role as the target of Biff's ...