List all the actors who have played characters with "captain" in their names.
List all the actors refers to person_name; characters with "captain" in their names refers to character_name LIKE '%captain%';
SELECT DISTINCT T1.person_name FROM person AS T1 INNER JOIN movie_cast AS T2 ON T1.person_id = T2.person_id WHERE T2.character_name LIKE '%captain%'