From the introduction: Mastodon is an adventure for The Strange suitable for beginning players. It starts on Earth but fairly quickly asks that PCs travel (translate) to the Mad Science recursion called Ruk. As an adventure designed to be run at a convention, Mastodon throws the characters right into the action. In addition, you’ll see alerts designed to give convention GMs cues regarding timing, and advice on whether or not to dive fully into a written encounter depending on the amount of time remaining for the session. Of course, GMs running Mastodon at home have more temporal freedom.