One week after the Changeling invasion of Canterlot, Twilight is taking a much needed vacation when she is met by none other than The Doctor, back from a lengthy trip to Equestria's past. Unfortunately for them a dark force has secretly taken control the Canterlot News Agency and is using its influence to spread paranoia and fear to the capital city. Now it's up to Spike, Twilight Sparkle, and The Doctor to find out who or what is behind this attack and stop them before it's too late!

After many a thrilling adventure the Doctor drops the girls off in Ponyville to relax and recharge. But then Rarity's latest client, a diamond dog mining magnate by the name of Zeitgeist Stardust, shows up to announce that he'll have to cancel his order for a new ensemble for the Grand Galloping Gala... but as compensation, he's offering Rarity and her friends a trip to the fabulous Dragon Valley Resort!

There's no such thing as a free lunch, though, as there's trouble brewing in the mines beneath Dragon Mountain. A race of creatures known as "Grundels" are sowing disaster and trying to sabotage Stardust's operation, for fear that the digging will awaken an ancient evil. Are the Grundels' fears justified, and can the Doctor and his new companions put a stop to this?

After witnessing a series of strange events Twilight Sparkle and friends search for answers, only to find themselves entangled in a war between two ancient races and a plot that could end all existence. Luckily, our heroes find help in the form of an eccentric brown pony with an impossible blue box.