CREATE TABLE table_name_15 (actual_title VARCHAR(255), writer VARCHAR(255), artist VARCHAR(255), issue VARCHAR(255))
What was the actual title of the show that had an issue number less than 508, was written by Desmond Devlin, and for which Tom Richmond was the artist?
    
SQL: SELECT actual_title FROM table_name_15 WHERE artist = "tom richmond" AND issue < 508 AND writer = "desmond devlin"