A brilliant and original research scientist in cosmological physics, currently at Cosmidyne Technologies. Dr. Hastings works on superstring theory, deciphering notes left by Infidel when he infiltrated Cosmidyne in 1996. Gretchen's insights "intrigue" Infidel.
After Samaritan's annual dinner with Infidel in 2006, it was revealed that she was willing to put her live in jeopardy by having Samaritan pique Infidel's interest in Hastings again. The notes he left behind were light years ahead of where Hastings was and she was willing to do almost anything for even a handful of notes. It was part of an ongoing ploy by Samaritan too to see if he could weaken Infidel's resolve and tempt him with Hastings, in order that he might want to get close to her and would consider using his talents for good. It is unknown whether Infidel ever tried too or not.