O crossover planejado de Halo e Call of Duty, incluindo mapas de Halo, foi descartado em 2024. Planned Halo and Call of Duty crossover, including Halo maps, was reportedly scrapped in 2024.

Uma colaboração planejada entre Halo e Call of Duty: Modern Warfare 3, que teria incluído mapas de Halo, teria sido descartada em 2024, de acordo com vazamentos do TheGhostOfHope. A planned collaboration between Halo and Call of Duty: Modern Warfare 3, which would have included Halo maps, was reportedly scrapped in 2024, according to leaks from TheGhostOfHope. Apesar de a Microsoft possuir ambas as franquias desde a aquisição da Activision Blizzard em 2023, o crossover não se materializou por razões desconhecidas. Despite Microsoft owning both franchises since the 2023 acquisition of Activision Blizzard, the crossover did not materialize for unknown reasons. Os fãs esperavam um personagem Master Chief jogável, mas a Sledgehammer Games agora está se concentrando em novos jogos Halo usando o Unreal Engine 5. Fans had hoped for a playable Master Chief character, but Sledgehammer Games is now focusing on new Halo games using Unreal Engine 5.