Red Dead Redemption: Undead Nightmare

Undead Nightmare is the 2010 expansion to Red Dead Redemption, and it can be played without the base game. A plague turns the frontier's population into the undead, John Marston's wife and son among them, and he rides out to find a cure.

It keeps the map and the systems of the main game and rebuilds almost everything else around the outbreak.

Official Trailer

Red Dead Redemption: Undead Nightmare Official Trailer

A Complete Reworking of the Map

Towns are overrun and have to be cleared, then defended. Ammunition is scarce enough to matter. Survivors hand out missions from rooftops and barricades. The same territory you rode through in the main game becomes hostile in a way that changes how you travel across it.

Four Horses of the Apocalypse and Mythical Beasts

The expansion hides four legendary mounts, each with its own properties, and adds sasquatch, unicorns and a chupacabra to find. It is far more playful than the base game, and that tonal switch is a large part of why it is remembered so fondly.

Standalone, and That Mattered

Undead Nightmare was sold as downloadable content and also on disc for players who did not own Red Dead Redemption. Fans have asked for the same treatment ever since, and it remains the clearest example of Rockstar taking one of its worlds somewhere completely unexpected.