This episode of Bonanza is a showcase for Victor Sen Yung as Hop Sing, the Cartwrights' loyal Chinese manservant. When Hop Sing's pigtail is cut off by town bully Emo Younger (Sam Greene), Joe Cartwright vows to avenge this act of public humiliation-and is subsequently arrested for murder when Younger turns up dead. Working in concert with Hoss, Hop Sing attempts to clear Joe by utilizing the ancient Chinese art of fingerprint detection. Appearing in support of the regulars are Dick Foran as Gittner, Michael Vandver as Davis, Alan Bergmann as Gort, Lou Frissell as Jackson, and Gordon Dilworth as the Judge. First shown on December 15, 1968, "Mark of Guilt" was written by Ward Hawkins and Frank Telford. ~ Hal Erickson, Rovi