You can name Monk's biggest phobias, his grade-school crush, and his favorite brand of spring water. But what about the colorful characters who terrify, infuriate, fascinate, annoy and, in some cases, employ Monk?

How much do you really know about the many actors who have made memorable appearances on the show over the years? Take the Monk Guest Star Trivia challenge, and you'll soon find out.

TAKE THE "GUEST STAR TRIVIA"