Far from the Ponderosa, Ben Cartwright is badly injured in a fall from his horse. Seeking help in a nearby town, Ben's son Joe finds himself in the middle of a range feud, with no one willing to come to his assistance-except for an enigmatic stranger named Thornton (played by frequent Bonanza supporting actor Gregory Walcott). Written by Preston Wood, the episode is highlighted by a jaw-dropping nightmare sequence which still packs a jolt after all these years. "Thornton's Account" was originally broadcast on November 1, 1970. ~ Hal Erickson, Rovi