The Nerd is a stereotypical nerd who is interested in video games, movies, books, television shows, and women. Often, he imagines things he likes and says "That would be so cool" and later has a dream about them, with the dream not quite going as he would want. He has appeared in a total of 21 segments. Besides the Chicken and the Mad Scientist, he has appeared in the most segments and episodes than any other character.
- Voiced by: Seth Green
- Real Name(s): Arthur Kensington, Jr.
Episodes Appeared In:
- Seth's Revenge (Zombified)