def get_movies_starred_in(actors, actor_name):
    """
    Query helper to get the MOVIES an actor has starred in.
    :param actors: Dictionary (name of actor --> Actor node)
    :param actor_name: Name of the actor to get the MOVIES for.
    :return: List of MOVIES an actor has starred in, if there exists a node for him/her
    in the graph, else an empty list is returned.
    """
    if actor_name in actors:
        return actors[actor_name].movies_starred_in
    return []