Eagle Eye, Junior Spy, is an agent with M.I.5 1/2.
Going by numerical standards only, since we are not explicitly told otherwise, we must assume that this department in the British Intelligence system lies halfway between MI5 and MI6. What that itself means is anyone's guess.
Obviously we can deduce that his parents gave this individual a decent first and last name though what it is remains unknown though we do know that his grandfather is Colonel Thynne. As we do not know if he is on the paternal or maternal side, we cannot go any further.
What we do know is that this very diminutive individual, standing likely around 3' tall, is a brand new addition to the organization. This fact comes from our being able to watch his getting hired in the first recorded adventure.
Eagle Eye, dressed in what we will find is his customary white trenchcoat, crumpled black ?fedora?, and red shoes, drops by his grandfather's headquarters with the man's forgotten lunch asking for the umpteenth time if he can be a spy and yet again Gramps tells him an emphatic 'NO', complete with painting word on his bulbous nose in invisible ink (which we can read!). That is when Agent XY7 stumbles into the office with a knife in his back, axe in his head, hypodermic needle stuck in his nose, and bullet holes all around his waist. He drops onto the desk his report before dropping dead to the floor. That is when Gramps decides he needs an assistant.
Suddenly the short and rather goofy-looking fellow is enlisted into the service but only as an "unpaid temporary junior spy", codename "Eagle Eye". No training. No indoctrination. Luckily no paperwork to fill out. Just 'you are now part of the team' followed by an 'off you go' on the first assignment.
Throughout his explosive career, which I say because he is constantly being blasted from one place to another, Eagle Eye will go up against a very nasty and unpleasant fellow named 'Grimly Feendish', a very large, round, bald man prone to wear black except for an ever-present long thick red scarf tied around neck. Feendish is forever living up to his name as he always tries to find some way to take over the world and poor Eagle Eye is the man to stop him.