The Grox. They are a species of red aliens with cybernetic implants, they have made an empire of planets and feel only hate. Well, that, and laughter. Actually, laughter is their emperor, or 'empress' as you might say.
The ponies of Equus have long since stopped their search for other life in the universe, but when Twilight Sparkle stumbles upon the archives of the long lost research how will she react?