Three Changeling agents are tasked with blending into Ponyville to collect energy to feed the hive. For Calypso, it's what she's waited her whole life for. There are only two problems: her idiot partners Rosencrantz and Guildenstern.
Will the intruders be able to keep themselves hidden? Probably not.
Will their situation get progressively worse? Most likely.
Will things go horribly wrong? Absolutely.