It's About Time, part 6

The evening express train from Ponyville to Canterlot arrives precisely on schedule. Tonight, there are only three passengers getting off at the platform: two ponies and one dragon hatchling, all dressed in form-fitting black jumpsuits. They move away from the station and into the almost-deserted streets of Canterlot quickly and stealthily, for they are Ponies (and a Dragon) On A Mission.

...well, one of them is. The dragonlet is more interested in his ice cream cone than anything else.