What star of a prequel of M1 did a production company employ
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
?x1 ns:film.film.sequel M1 .
?x2 a ns:film.production_company
}