The Krelboynes are a group of gifted students who are always referred to as "Krelboynes" by their fellow classmates. About 6 Krelboynes make recurring appearances. They have been noted to have a hard time making non-krelboyne friends because of their almost nonexistent popularity. It has been stated that the coolest Krelboyne was Malcolm. despite there being many female krelboynes in the class, only one has any recurring appearances. Here is a list of all the Krelboynes that attend the Krelboyne class:
Main article: Malcolm Wilkerson
Malcolm Wilkerson, played by Frankie Muniz, is the main protagonist of the show and is the middle child of the Wilkerson children. He is a Krelboyne from season one to season 4.
Main Article: Stevie Kenarban
Stevie Kenarban, played by Craig Lamar Taylor, is a Krelboyne and Malcolm's best friend, Stevie is sarcastic and has a few physical disabilities which he ignores so he can live life as a normal teen.
Main Article: Lloyd
Lloyd, played by Evan Matthew Cohen, is the overly dramatic, physically frail, and nerdy Krelboyne friend of Malcolm Wilkerson.
Main Article: Kevin
Kevin, played by Victor Z. Isaac, is a nervous and excitable Krelboyne friend of Malcolm and his fellow Krelboynes, his character replaced Eraserhead.
Main Article: Cynthia Sanders
Cynthia Sanders, played by Tania Raymonde, is a new and outgoing Krelboyne girl who joined the series in season 2, she is the only Krelboyne girl to have any role at all.
Main Article: Dabney Hooper
Dabney Hooper, played by Kyle Sullivan, is Malcolm's emotionally stricken and flamboyant Krelboyne friend and Malcolm's best friend for the first four seasons.