***DISCLAIMER*** The characters of My Little Pony: Friendship is Magic are by Hasbro (Although contrasts from the timeline of the series of the Television show)
MLP: Alternate Crossover is a alternate series not to be true to the original..and character sometime are fan-base by yours truly such as (Cosmic Star, Princess Cosmic Harmony, and Midnight Moonstone, etc.)

As Twilight Sparkle and the Mane 5 has something weird from their Universe, Cosmic Star is having problems with hers with the Elements of Harmony as the same comes to Princess Luna being captured and Princess Celestia becoming ill for unknown reason...as two worlds collide its up to the Princess of Friendship and Princess of Harmony to help out the two sisters and their world from an unknown force that seeks destruction to the world....