At JALT CALL 2022 the presenters displayed their plan to run a seven-day, 49-hour intensive English course as a single megagame called Watch the Skies. In this session they will show the outcome and discuss the design, development and implementation of a course for 18 non-English major students. The game is a UN-simulation featuring humanity’s first contact with an alien civilization. Teams cooperated and competed to improve their relative standing as they roleplayed nations dealing with an existential crisis. The core components of the course were communicative activities that were adaptations of existing games or gamified versions of speaking activities such as negotiations and debates. Activities awarded game points and influenced the story outcome. Throughout the week nations spent resources in the form of stability, military, economy, and science points to accomplish goals and earned resources and points by performing well. The course used a collaborative storytelling (roleplaying) framework to maintain interest and make thematic decisions compelling. Students were evaluated on their performance during the activities and in the end-of-session presentations. Participants will learn the fundamentals of Game-Based Language Learning (GBLL) course design and practices for structuring courses as thematic games.