It looks similar to the Legend of the West Outfit with a number of changes:
- There is no vest and the shirt is unbuttoned.
- The outfit does not feature the bandolier, whereas the 'Legend of the West Outfit' does.
- The gloves are gone, and Marston is wearing a rosary and a red pirate-style sash around his waist similar to the one worn by Landon Ricketts.
- His belt has been replaced with a more ornate belt buckle.
- The black duster coat is considerably more worn, with a large tear on the right shoulder and multiple holes along the frayed bottom.
- The outfit has multiple blood stains, and Marston's face is dirty similar to the Treasure Hunter Outfit, with the addition of blood on the right side of his face.
- Marston's Trousers/Pants hang over the boots, rather than being tucked inside.
- Most noticeable is the larger feathered hat replacing Marston's normal hat.
The outfit's name changes from "Legend of the Apocalypse" to "Legend of the Undead" after completion of Undead Nightmare.
This outfit also increases the duration of phosphorus bullets.
- Legend of the Apocalypse --- "As a Legend of the Apocalypse, your phosphorus treatment lasts longer."
- Legend of the Undead --- "Nnnrrguuuuuh"
- After Undead Nightmare is completed, this is the only outfit available to Marston that has a hat.
- After Undead Nightmare is completed, this is the only outfit that does not feature gloves.
- The outfit sort of resembles that of Hugh Jackman's character in the movie Van Helsing.
- If the Legend of the Apocalypse outfit is not unlocked before completion of the DLC, the menu entry for the outfit may disappear and will not appear when looked for in the outfit menu. To remedy this, simply complete level 5 of a challenge and it will be added.
- If the invincibility cheat is enabled, the player is wearing this outfit, and the player is lethally close to dynamite, the player's rifle holder will disappear.
- If the player wears this outfit and completes the campaign, then Undead Marston will come out of his grave wearing this outfit.