Inspector Gadget was a policeman who appeared to either be half man, half robot, or just have loads of clothes with gadgets in. I was never sure.
With his cry of "Go Go Gadget Somethings", something would pop out of him, and he suddenly be superpowered.
Go Go Gadget Helicopter, for example, would bring forth a helicopter from his head, complete with handles for steering.
His neice, Penny, usually tagged along to ensure he didn't get into any tight corners, and her dog Brain also helped loads.
Chief Quimby, Gadgets boss, usually gave Gadget his orders on self destructing pieces of paper, and Gadget would read them and promptly give them back, injuring Quimby every single episode.
You'd think he'd have learnt after the second or thind one.
The baddies were Doctor Claw, and his pet Mad Cat, who were well known for saying "I'll get you gadget!"