SG-1 is sent through the Stargate as a forward scouting team for an extended scientific mission to P3X-597. Arriving in a long abandoned castle, the team heads out for the nearest village. As they approach, it becomes clear that the locals aren't exactly human. Their contact with the pony-like aliens goes well, conveniently timed alongside a celebration of the sun, until an over-the-top, hammy, evil pony appears to ruin the festivities.
A Stargate SG-1 crossover.