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Humorist Samuel Clemens, aka Mark Twain, makes his third Bonanza appearance, this time in the person of actor Ken Howard (fresh from his Broadway and Hollywood triumph in the musical 1776). As editor of the Virginia City Enterprise, Clemens is determined to prove that a government assayer is guilty of fraud and murder. Because he won't reveal his source in court, Clemens loses a libel suit, whereupon he enlists the aid of Ben and Joe Cartwright to bring the villain (who in the interim has committed another killing) to justice. The episode's closing scene, involving an outraged lady stagecoach passenger, is priceless. The supporting cast includes Dana Elcar as Merrick, Phil Kenneally as McNabb, Walter Burke as Campbell, Staats Cotsworth as Judge Hale, Richard Bull as Goodman, and Stacy Keach Sr. as Lawyer Prentiss. Written by Stanley Roberts, "The 26th Grave" was the first Bonanza episode to be filmed for the series' fourteenth season, but was shown as the eighth installment on October 31, 1972.