The Beast is a unique player and NPC featured in Grand Theft Auto V and Grand Theft Auto Online.
Hunt the Beast
When the Freemode Event begins, players opt into a vote to become the Beast, and after 5 minutes, the game picks a random player out of those who opted in to be the Beast. From here, the Beast goes incognito on the in-game map and has to reach 10 landmarks without being killed by other players. The player has unique abilities, such as super jump, fast running, and super strength, which can aid him in reaching each landmark. However, The Beast can be briefly viewed on the radar after collecting a checkpoint at a landmark or if it does not collect a checkpoint for 3 minutes.
Beast vs. Slasher
Later, as part of the Festive Surprise 2015 update, the Beast returns as a protagonist in the "Beast vs. Slasher" Adversary Mode. In this mode, the Beast is up to fight against Slashers, who were featured in an previous homonymous Adversary Mode. This mode plunges the city into darkness while the Slashers and the Beast are up against each other. The Slashers is equipped with weapon loadouts, while The Beast uses his own unique abilities.
With the release of the aforementioned updates, the player is able to fight the Beast in Grand Theft Auto V. This can be done by collecting all 7 golden Peyote Plants. Once completed, the player is able to play as a Sasquatch in Director Mode. When playing as the Sasquatch, entering the south-eastern corner of the Thomson Scrapyard will result in the weather pattern changing, and The Beast will spawn on the roof of a plane fuselage. The Beast will act hostile towards the Sasquatch, retaining his fast running and super jumping abilities, however, he is much weaker than in the mentioned Online missions (due to the strength properties applying to the GTA Online protagonist's health system rather than the character model itself,) and can be taken down easily by the Sasquatch.