Franchise Ownership Acquisition: The Command and Conquer franchise of Westwood Studios fame was originally owned by Virgin Games, who purchased Westwood in 1992, three years before the first entry of the franchise. The studio, along with the franchise, changed hands in 1998 to Electronic Arts. After Westwood dissolved in 2003, EA continued to own the franchise and make additional entries via various in-house development studios all the way until 2012. In 2020, EA licensed out the first two games to Petroglyph Games, founded by former Westwood staff, for remastering.
Phazon is radioactive, semisentient, and mutagenic. It causes mutation by directly inserting its atoms into native DNA rather than corrupting their data, the same way Tiberium does.
While the "Color of Madness" DLC from Darkest Dungeon is based on The Color out of Space, it also has mutants with greenish crystals growing on them, and the surrounding area.
The music video for Telephone by Lady Gaga has Tiberium as part of a recipe for poison.
The whole modern military theme wasn't in the original plans for the first game. It actually started out as a fantasy RTS, until they believed that fantasy was niche and modern military was more relatable with the then-recent Gulf War. The direction of what would become an entire series basically hinged on this change in direction.
Command & Conquer: Continuum was going to be a Command & Conquer MMORPG.
There were several non-starter games with the "3" in the title. While we would ultimately get versions of both, between Generals and Tiberium Wars there was a developed version of Red Alert 3 that was ultimately cancelled, and Westwood's C&C3 (and its would-be first 3D RTS produced in house) went down with Westwood and much of its development assets would lay the foundation for what became Generals.