An argument between Twilight and Rainbow Dash over the most recent edition of Daring Do causes Twilight to learn more things about her friend than she had even suspected.
As a fan of the show, I always loved Rainbow Dash and her cutie mark, but I never wanted it to appear on my leg! Now that it has, all sorts of things are getting weird around here. I'm a guy, not a mare! Cartoon ponies aren't real... right?