- as Adrian Monk
- as Sharona Fleming
- as Trevor McDowell
- as Angie Morrison
- as Tillie Graves
- as Carl Jenkins
- as Arthur Zaleski
- as Tonday Mawwaka
- as Sportscaster
- as Gwen Zaleski
- as Man in Sweater
- as Mrs. McDowell
- as Uniformed Cop
- as News Anchor
- as Lt. Randall Disher
- as Young Monk
- as Annoyed Woman
- as Captain Leland Stottlemeyer
- as Dr. Charles Kroger
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Watch "Monk > Mr. Monk and the Marathon Man":