A Secret Level Halo x Doom crossover was pitched but was ultimately shutdown by Microsoft. Gamers react to the company dropping the ball.

Secret Level is an animated anthology show that reimagines a handful of iconic games - from Pac-Man and Spelunky to Armored Core and The Outer Worlds - in small, self-contained episodes, but the series' creators had originally pitched a badass-sounding crossover between Halo's Master Chief and the self-titled Doom Slayer that sadly never came to be.

The creators of Secret Level have revealed they pitched a Master Chief/Doom Slayer crossover episode that was turned down. Season 1's 15 episodes are each based on a different video game, some of which are pretty surprising picks for an animated adaptation.