question: What actor did a film star and M1 's prequel star
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.actor .
  ?x0 ns:film.actor.film/ns:film.performance.film ?x1 .
  ?x0 ns:film.actor.film/ns:film.performance.film ?x2 .
  ?x1 ns:film.film.sequel M1 .
  ?x2 a ns:film.film
  }