Even Halo jumped in on the crossovers : r/Doom

The Doom Eternal X Halo Infinite Crossover

How would you do a Halo/Doom crossover?, Page 2

How would you do a Halo/Doom crossover?, Page 2

Millennium, DC Database

Another epic crossover : r/Doom

This would be a sick game once the respective studios finish their current projects : r/Doom

Superhero Comic Books: The 100 Best Runs You Must Read – The Hollywood Reporter

All Tomorrows crossover: The Qu's Extinction (commissioned by me, drawn by u/spartans_doodles) : r/halo

The 25 best FPS games to play in 2023

Who would win: Doom Slayer with his upgrades from Doom Eternal or Master Chief with his new suit from Halo Infinite? - Quora

Every single Fortnite collab & crossover in battle royale's history - Dexerto