Code Lyoko: The Adventure Begins was the first Code Lyoko book published, and to date, the only one published in English. In French, it was published as "Code Lyoko: L'Aventure Commence". This book was written as an adaptation of "Teddygozilla" and "Plagued". The book is written in comic format, using screenshots from the episodes. The books also have some bonus features, one of which mentions Franz Hopper.
However, there are many errors in the books: Some character's names are misspelled, such as Jeremie being spelled Jeremy, Sissi being spelled Sissy, and Odd saying Laser Dart instead of Laser Arrow. Franz Hopper is called a former student, not teacher. This last mistake may or may not be an actual mistake, given Kadic Academy's age.