A specific case of Million-to-One Chance: the laws of probability are nothing compared to the power of Narrative Causality. Often seen in franchises involving space travel, possibly because Sci-Fi Writers Have No Sense of Scale and can't figure out how big a single planet is, let alone an entire galaxy. It often occurs in real-life settings as well, albeit on a smaller scale. More often than not, said planet also happens to be a Single Biome Planet, Baby Planet, and/or a Planetville. Examples of It's a Small World After All include: