The Flux

The Flux was a cataclysmic threat described by Karvanista as a "hurricane ripping through structure of this universe" that was set to disrupt every particle. (TV: The Halloween Apocalypse) It rallied species such as the Sontarans, Weeping Angels, Ravagers, and "other species from across the universe". The Thirteenth Doctor hastily created a distress call warning of the Flux' impeding arrival. (WC: The Flux is Coming...)