Call of Duty fans have been patiently waiting for more information about one of the most highly-anticipated Zombies maps coming in the next installment of the franchise.

Blood of the Dead, a remastered version of the classic Zombies map Mob of the Dead, will be featured in Call of Duty: Black Ops 4—and now fans have been given a new trailer to dissect.

Mob of the Dead was released for Black Ops II in April 2013 with new playable characters: Michael “Finn” O’Leary, Albert “Weasel” Arlington, Salvatore “Sal” DeLuca, and Billy Handsome. But Blood of the Dead will feature the original Zombies cast of Dempsey, Richtofen, Takeo, and Nikolai in the Mob of the Dead setting—Alcatraz Island in San Francisco.

The new trailer shows Dempsey and crew wandering around the Alcatraz prison until Richtofen runs into a version of himself from a different timeline. After a heated discussion, the other Richtofen disappears through some strange portal.

The rest of the trailer shows the Primus crew running from and fighting off hordes of the living dead. Brutus, a boss zombie introduced in Mob of the Dead, also makes a cameo in this trailer—he destroys one of the portals that our four heroes try to use to escape while yelling “I will be reborn.”

This awesome trailer gives CoD Zombies fans a glimpse at the backstory of why the traditional characters are making an appearance on this classic map. Although we don’t know much else about Blood of the Dead, it’s safe to assume that Treyarch has an intricate Easter Egg planned for this remastered map.

Blood of the Dead will be available as soon as Black Ops 4 is released worldwide on Oct. 12.