After Doc manages to repair the time machine, he provides Marty with a cowboy outfit (albeit one that is almost too colorful for the old west), and takes them to a closed Drive-In theater near an open-area of land.
Doc explains that since the open country hasn't changed much in over 70 years, Marty should be able to avoid anyone seeing the time-machine, or possible crashing the DeLorean.
Doc then sets the time circuits in the DeLorean to September 2nd (since the letter was written on September 1st.
This is done so that Marty cannot interfere with Doc writing the letter and having it given to Western Union...to avoid a possible time paradox), and Marty drives off.
However, once arriving in 1885, he finds himself almost run over by a group of Indians, followed closely by Cavalry men who are chasing them.
Marty drives the DeLorean across the rocky terrain, before finding a small cave to hide the DeLorean in.
However, after getting out, Marty finds two things: 1) the rocky terrain has somehow ruptured the vehicle's fuel line, and 2) a bear is also in the cave.
Marty quickly rushes away from the bear, but falls down a nearby hillside, crashing into a fence, and falling unconscious.
When he wakes up, he finds himself in the home of Seamus McFly (also Michael J. Fox), and his wife Maggie (Lea Thompson), and their infant son, William.
Marty soon realizes he is in the homestead of his ancestors, and claims that his name is Clint Eastwood, when they ask him who he is.
During dinner, Marty explains his searching for the local blacksmith, and Seamus offers to help. Marty gets a new hat from Seamus.
The next morning, following Seamus's advice, Marty follows the railroad tracks to the train station for Hill Valley...albeit a Western mining town that is still being developed.
Even the iconic clocktower that Marty knows is still being constructed, with a dedication to take place the coming weekend.
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