When Applejack is overtaken by something more mysterious than ever imagined, it's up to the rest of the Elements to find out what happened. What they find is more surprising than anything else...

Loosely based on a story of the same name by Ray Bradbury, a science fiction author.

When Nelly, a girl of young age and elder mind, is transported to Equestria, it isn't the one she was expecting. Princess Celestia is a tyrannical mad scientist who brings humans to Equestria, conducts experiments, then does something horrible to them. (It's not raping...why would you think that?) Twilight Sparkle, still her faithful student, helps with all this, however unwittingly. But the most horrible thing of all is that nopony know what friendship is. In a utilitarin-futuristic Equestria, will Nelly be able to escape the wrath of Celestia? Find out in...Test Subject!

Rated Teen for language. Nothing else, folks; this is by no means a clopfic.