The term 'ACTION-FILM STAR' can be summarized by the 6-letter solution SEAGAL. Steven Seagal is an American actor, producer, screenwriter, martial artist, and musician who is best known for his action films. He has starred in numerous films such as Above the Law, Under Siege, and Hard to Kill. Seagal is also a 7th-dan black belt in Aikido and has used his martial arts skills in many of his films.