In recent years, with the rapid development of the internet, the digital entertainment industries centered around gaming have increasingly shown a trend of cultural diversification and integration. The crossover between movies and games has become a popular industry chain, with great market potential, attracting more and more game and film companies to join in. Compared to abroad, domestic scene is still in its infancy in this field, facing many challenges in cross-media collaboration between movies and games. These include how to successfully adapt game IPs for film narratives, how to align the visual presentation of films with their game counterparts, and how to achieve better commercial effects when games are adapted into films. This article explores the rise and development of the crossover between movies and games, analyzing League of Legends: Arcane from aspects such as narrative, audio-visuals, and audience. It discusses the challenges of this crossover and proposes solutions, also forecasting future trends.