Which male film producer was M1 's prequel 's prequel 's producer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:people.person.gender ns:m.05zppz .
?x1 ns:film.film.sequel ?x2 .
?x2 ns:film.film.sequel M1
}