In 2152, while inside a neutronic storm, Enterprise NX-01 set a course for a cluster of plasma eddies in an attempt to persuade members of the Takret Militia, who had taken control of Enterprise, to leave the ship. (ENT: "The Catwalk") In the final draft script of "The Catwalk", the plasma eddy in that installment was described as "a vast and ominous vortex of energy!"