Terrance Sorenson, alias Equinox, is among the villains contained at the Negative Zone prison during the raid by Captain America's Anti-Registration forces. After the heroes Nick Fury rescued discovered that the nanites Pro-Registration forces created to control criminals became sentient and sought to spread and infect more people and add them to its collective network, Fury accompanies them as they head into the Negative Zone prison to collect unused nanite samples, which they need to develop a countermeasure for in case the nanites become a problem. The first sample they go after is used on Equinox, whose injection and activation are rushed in a hasty effort to stop Fury's group from proceeding. The team defeated him and sought another nanite sample.
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