 It was introduced in "Excalibur" vol.1 #101, by Warren Ellis under the call sign "The Department" for ten years until "New Excalibur" #1 explicitly mentioned the term "MI13"; although invariably referred to as such, the agency's official name is the Extraordinary Intelligence Service (EIS).The department is closely associated with Marvel characters and Pete Wisdom, and, after being named MI-13, it would subsequently appear in "Wisdom", and most recently, the ongoing "Captain Britain and MI13"; both written by Paul Cornell.