So Back to The Future II basically :-) (edit below) (1985 Marty + Doc) => 2015 (2015 Biff) => 1955 => 2015 (he shouldn't be able to return here) (1985 Marty

So Back to The Future II basically :-) (edit below) (1985 Marty + Doc) => 2015 (2015 Biff) => 1955 => 2015 (he shouldn't be able to return here) (1985 Marty + Doc) 2015 => 1985' => 1955 => 1985