Back to the Future Season 1 Episode 13 Clara's Folks Episode Title:Clara's Folks.Episode Description:Verne, Jules and Marty head back to 1850 Wyoming to meet Jules and Verne's maternal grandmother on the Oregon Trail. Once they arrive, Martha falls instantly in love with Marty and causes Clara to disappear in the future (mirroring the events of the first film). The boys and Marty must arrange for Martha to meet Daniel, their grandfather, so the two of them can fall in love. Wild Bill Tannen (Buford "Mad Dog" Tannen's father) enters the picture and kidnaps Martha for himself. Doc, who has used the locomotive to travel back in time, arrives with Daniel to find that Wild Bill has run away and Verne and Martha are in the process of being attacked by a Grizzly Bear. Doc surveys the area, recognizes the terrain and instructs them to throw a buffalo hide over a hole and mere moments later, a column of water (Old Faithful) elevates them up and out of danger. Daniel and Martha's eyes meet and they fall in love. History is back on track. Buford "Mad Dog" Tannen, son of Wild Bill Tannen, has been seen one time in Back to the Future Part III. Bill Nye Segment: Examining geysers.