Doctor Egghead

Also known as Dr. Egghead and Professor Egghead, the inventor of the dubiously useful non-elastic rubber band.

Kidnapped by C.I.N., Egghead is forced to reveal that the secret to his discovery originates in the swamps of the Florida Everglades and is taken there forthwith so that C.I.N. can take possession of it.

Egghead is rescued by Smart and 99 but upon returning to CONTROL it is revealed that the professor is in fact the Chief's Uncle Ed and the real Egghead is safe and sound elsewhere.

[Comic Strip Story #7 (Unofficial title: "Doctor Egghead").]

Reality Check: The term Egghead is a slang pejorative for an intellectual person. It is also the name of a number of fictional characters, including villains from both the DC and Marvel universes, but the character in this story does not appear to refer to any in particular.