In 2003, Appier re-joined the Royals, and he made his last MLB appearance with the Royals on April 23, 2004. Appier amassed a 169-137 career win-loss record to go along with a 3.74 earned run average and 1,994 strikeouts. Over the course of his career, he averaged 14 wins and eleven losses per season. He earned one All-Star berth in 1995. Appier was part of the Angels’ 2002 World Series Championship as a starting pitcher.