The Rainbow Factory. Ponies have wondered how the Pegasi create the colors of the spectra in order to create rainbows. There have only been rumors...and nopony ever knew what REALLY went on inside that factory. Those that went in couldn't even tell of what happened...because they dd come out alive.

Crimson Fire, a pegasus, and her best friend, an alicorn named Diamond Water, find themselves outside of the factory. Intrigued, they enter the Rainbow Factory. When they meet Crimson's old friend Rainbow Dash inside, Rainbow decides to give Crimson a job. Crimson is overjoyed; that is, until she is separated from Diamond and she finds out how rainbows are REALLY made.

Not wanting to lose her friend to the Factory, Crimson must venture into the darkness in order to save Diamond from the Pegasus Device.

[This is kind of like a prequel to 'And Not a Single Soul Gets Through', but technically, it's also like an alternate story. They both have the same plot...kinda. But they're different. Meh. I'm confuzzled.]