The Common Cold is a recurring antagonist of Codename: Kids Next Door. He is an eternally ill villain who wishes to spread his cold to everyone else in the world and uses a machine to fire mucus from his nose at his enemies. He is Numbuh 2's arch-nemesis and Anna Worthington's uncle.
The Common Cold first appears in Operation: T.O.M.M.Y., in which Numbuh Two's brother, Tommy, aids the Common Cold out of jealousy for the KND, building a machine for him that transforms him into the "Flu Bug". Numbuh Two's mother used chicken soup to counter the machine and defeat the villain.
The Common Cold never got a starring role in an episode again, but made several minor appearances.
- The Common Cold's weaknesses include chicken soup and Vitamin C. However, even though some products claim it does, Vitamin C does not treat or cure the Common Cold.