|Show||The Adventures of Jimmy Neutron: Boy Genius|
|First Appearance||"Jimmy Neutron: Boy Genius", December 21st, 2001|
|Friends||Jimmy, Sheen, Cindy|
|Enemies||Professor Calamitous, Beautiful Gorgeous|
Carlton Ulysses "Carl" Wheezer is Jimmy's neurotic, llama-loving, best friend. According to canon, he is 11 years old. He is known as nervous, timid and suffering from hypochondria. At times, he tries to overcome these personality traits in order to appear "cooler" around Jimmy and mutual friend, Sheen, even though he has a sensitive Scapula and spine. He has many talents, the most recognizable is his extraordinary singing ability. He is voiced by Rob Paulsen.
Carl also appears to be in love with Jimmy's mother, Judy Neutron, accidentally saying that she is beautiful around Jimmy and Sheen, carrying around a picture of Jimmy's parents with his head pasted over Jimmy's father's face. In many times in the episode "Love Potion 976/J" Carl really dislikes Jimmy's father, Hugh Neutron, whenever he is around. Though, in "Carl Wheezer, Boy Genius", his love interest was Elke Elkberg, his Swedish pen-pal who was voiced by Grey DeLisle.
Nicktoons: Globs of DoomEdit
Carl appears as a non-playable character in Nicktoons: Globs of Doom. He is one of the many people who is trapped in the goo. He is the first one to be saved when the party reach the exit gates of Retroland. He asks for help because he has allergies and thanks when you save him. He goes to Volcano Island afterwards.