Closure, whose real name is Ada Church, is a tech-savvy Sarkaz Vampire and the brilliant Chief Engineer of Rhodes Island.

Long known to operatives as the mischievous and money-loving manager of the Rhodes island shop, she is actually a legendary hacker—once dubbed the "Destroyer of the Kazdel Information World"—and one of the original founding members of the organization alongside Kal'tsit and the Doctor.