The Lost Episodes of Doom is a book/disk package. The book provides a detailed guide of the 24 new levels with stories that are a crucial element to this game. Created by Christen Klie and Robert Carter with Jonathan Mendoza, the author of The Official DOOM Survivor's Strategies and Secrets.There are no new weapons, only maps, 3 demos, and new episode names:"Massacre on Callisto""The Killing Fields of Io"and"Hell's Gate -The Red Spot".