A backtrail is a track back to one's starting point.
The Lone Ranger - 1949 Backtrail 2-26 was released on: USA: 8 March 1951
Zane Grey Theater - 1956 Backtrail 1-18 was released on: USA: 1 February 1957
if you backtrail into hartherome the gym that wouldn't do anything will work after doing the fourth gym