Jemima Thursday previously worked for MI9.
Jemima Thursday was, at some point, one of MI9's top spies, but was discarded in favor of technology.
Jemima comes to St Hearts, masquerading as new cleaner Marjorie. Using a voice changer, she made Mr Flatley acting Prime Minister, helped Dan, Aneisha and Zoe rescue Sebastian from KORPS and got Sebastian on his own. She broke into HQ and reversed the molecular accelarator. However, Dan makes her see the error of her ways and she helps the team fix the damage she's done.