Strange matter was a substance that was the result of or could create spatio-temporal anomalies. (PROSE: Spiral Scratch) Strange matter was related to quarks and was very dense. Small pieces could weigh as much as a planet. Colliding two pieces of strange matter could create a Time Manipulator. (TV: Time and the Rani) An unnamed planet was protected from outsiders by strange matter. (PROSE: Vanishing Point)