Twin Peaks Quiz

Everything about the cast of Twin Peaks, the ABC mystery that opens with a body found on a riverbank and an FBI agent sent to a small Pacific Northwest town to answer one question: who killed Laura Palmer. The set covers the original run: the two seasons that aired in 1990 and 1991. In scope is the main cast, the performers billed in the opening credits across those two seasons. Recurring players and guest stars are out, however memorable the role. The continuation that arrived a quarter of a century later is a separate production with a cast of its own, so the performers who joined for it are not answers here, though a few questions in the trivia round do touch on the fact that it happened. Every answer is the performer, not the character. One performer in the set plays two roles, so the set covers one more character than it has answers. Cast taken in billing order from the series' opening credits as listed on Wikipedia, corroborated against Wikidata. Nothing here gives away the solution to the mystery: no question, clue, option or answer in this set names the killer.