Spy-Smasher Smith is an agent with MI-5.
To quote the opening statement in the first graphic adventure of this individual, "To look at Mr. Smith you would not believe that he is the man who is called when things get too hot for M.I.5 to handle".
His designation is Agent 005. By the mythos of brother agent James Bond, that would give Mr. Smith the license to kill but Smith does not do anything particularly violent. A good number of violent things are done to him but Smith remains an even tempored individual.
A short, middle-aged man nearly bald except for fringes above the ears and a few strands combed over the dome of his head, Smith sports a well-groomed bushy mustache. As this is Britain in 1964, he wears a bowler hat when outside and always is suitably armed with an umbrella in his left hand and a satchel in his right. In the satchel he carries: compass, scout knife, "catapult bubble gun", and red tape. The gum part is a bit confusing to me but the other things will be useful to him a time or two.
Smith answers to Colonel Crossfire, head of counter-Intelligence in M.I.5., a fat bald older man who always seems about to explode with apoplexy.
His arch-nemesis is Doktor Skull, a very short, bulb-headed bald evil genius with a black eye-patch over his right eye. Skull is the head of an international spy organization.
Smith does go through a bit of title changing over the short time we follow him. The name of his chronicles is "Spy-Smasher Smith, Agent 005" for the first 5 segments of the first adventure and "Mr. Smith, Agent 005" for the last. It is "Mr. Smith of M.I.5 1/2" for the next two full adventures, though there is no mention why his department got a half-number bump. In the final adventure's segments, no codename or department name is mentioned with him just being designated "Mr. Smith". There is also no explanation as to why in the beginning he had the nickname of "Spy-Smasher" but then again, why shouldn't he have it?