After completing another friendship mission in Equestria, Luster Dawn has been given a dangerous one from the Royal Advisor Spike the Dragon. From the message that she received from the dragon, Luster learns that Queen Twilight Sparkle, the ruler of Equestria, has been taken by a demonic army that came from the depths of hell in Canterlot's underbelly. Wasting no time, Luster and her friends make their way down below the city to rescue Twilight and save the palace while battling against the forces of hell.

*Based on the best video game franchise Doom*

*This is a crossover story between MLP and the Doom series*