Franklin encounters a hunter in the Raton Canyon trying to hunt a sasquatch. After a conversation, he convinces Franklin to help him. After locating the beast, Franklin chases it down. After the sasquatch stops, Franklin shoots it, leading the creature to ask Franklin in English to shoot him again. Franklin then pulls off the bigfoot's head, which turns out to be a mask worn by a man in a suit who acts like he really is a sasquatch. After being questioned by Franklin, the man states "it's perfectly normal to admit to being aroused role-playing dressed as a fantastical beast," and then barks, extremely similar to that of a canine. Franklin asks, "what the fuck was that?", and the man replies, "what do you want it to be?". The cutscene ends and the player can either leave or kill the man.
Investigate the scat site
Kill the Last One
Gold Medal Objectives
Wounded - Shoot the Sasquatch 3 times before catching it
Hunter - Kill 4 animals whilst chasing the Sasquatch
Mr Green - Go to the scat site on foot
This mission does not immediately appear upon reaching 100% completion and can take a random amount of time to pass before it does, with players reporting having waited as long as one in-game month. To force the mission to appear, enter GTA Online and play for several minutes, then return to singleplayer as Franklin. It should be on the map as a green question mark.
The hunter appears to be almost identical the sasquatch hunter from Red Dead Redemption: Undead Nightmare. Sporting the same grey (most likely an animal carcass) hat, blindness in his left eye, and a big, bushy, beard. However, the hunter wears a more modern set of clothing, though in the same color scheme as the sasquatch hunter.
The game never refers to the man in the suit as bigfoot or a sasquatch, only as "the Beast" or "the Last One," including the subtitles when a character calls him a bigfoot or sasquatch simply say "the Beast", though the hunter does refer to him once as the "'quatch".
This mission is not mentioned in the official strategy guide of GTA V.
In the mission Predator, you could see something looking like Bigfoot appearing through the Thermal Scope. It appears just for only a second and disappears. This could be an Easter Egg, or foreshadowing of this mission as "Predator" takes place in the same vicinity.
Challenges in this mission include the fact that cougars roam the area and will attack, and the fact weapon lock is disabled, making both shooting the Last One and quickly shooting at an attacking cat more difficult. Franklin must stay within a certain distance of the Last One or risk losing him and failing the mission.
The name of the mission might also be a reference to the fact that this is the last mission unlocked and possibly the last mission the player finishes making it "The Last One".
Only Franklin is able to access this mission owing to the fact he's the only protagonist guaranteed to survive regardless which ending is chosen.