The term 'SERIES OPENER' can refer to the first installment of a television series, movie franchise, or book series. The crossword solutions for this term are PONE (4 letters), ESS (3 letters), ONE (3 letters), MINI (4 letters), PILOT (5 letters), WORLD (5 letters), ALPHA (5 letters), PARTI (5 letters), PARTONE (7 letters), and EPISODEI (8 letters). These words all refer to the first installment of a series, such as the PILOT episode of a TV show, the first book in a series, or the first movie in a franchise.