From the artist behind the world of Cartoon Network's Adventure Time, this is a detail-packed coloring adventure into the deep, dark, and hidden places within our planet.

Expand your mind and creativity with this wildly imaginative adult coloring book. Discover the maze of caverns, ancient insectoid temples, spooky reptilian swamps, lush alien jungles, and forgotten cryptid cities beneath our feet. Bring these alien worlds to life as you color, with each page leading you further underground. If you're not careful, you might not find your way back out.