As princess of Equestria, it is important that Luna is protected at all times. But maybe she should have put more thought into who she chose to protect her.
Pinkie has a secret. So far, she's kept it from everyone, but Twilight can tell that something's wrong with her. So she offers what vague support she can… until Pinkie takes her into the basement to show her.
Ditzy Do's eyes aren't broken. There's nothing wrong with her. She's just watching something. Something in the corner of your eye. For Goddess's sake, don't look.
Drafted into the defense of Equestria, the Crusaders volunteer to embark a series of dangerous operations behind enemy lines to cripple one of their chief technological advantages, a revolutionary spell matrix that Twilight refers to as the "radio."