In the 1963 film ProfessorJulius Kelp is known for his clumsiness and generally shy and awkward demeanor. When he meets the beautiful and attentive Ms. Purdy he tries various methods to have a more charming persona. When he creates his serum it seems at first to have terrible consequences but this is dissipated when he arrives at the local bar. His alter ego Buddy Love is known for his ease for words and assertiveness but also for his brash behavior and aggressive attitude. He also possesses a talent for singing and playing the piano. Nevertheless the serum seems to dwindle as he reverts after a short while and even seems to lose his singing at times. At the end the serum's effect ends and he reverts in the midst of a song with the school's big band.
''The Nutty Professor'' (1996)
Throughout the first film, Professor Sherman Klump is portrayed as highly intelligent and generally respected by his students, as well as being a fundamentally friendly man, but has occasional clumsy accidents due to his obesity. Additionally, his lack of confidence makes him him a victim to bullying and verbal abuse from the Dean of the university. Having recently fallen in love with grad student and chemistry teacher Carla Purty, Klump uses his latest discovery, a weight-loss serum that rewrites the subject's genes, to lose weight in order to spend time with her. Unfortunately, this serum creates the confident but mean-spirited individual known as Buddy Love, due to the testosterone imbalance caused by the transformation causing Buddy to manifest as an independent personality. When Klump's student and assistant Jason learns what has happened, he realizes that Buddy is gaining increasingly greater freedom from the professor's influence. This encourages Klump to take back control of his life, disposing of most of the serum and 'fighting' Buddy for control of the body before Buddy can drink enough of the last samples of the serum to eliminate Klump forever. At the conclusion, Klump admits what has happened to the faculty staff after he transforms back to normal in public, concluding that he must learn to accept himself as he is.
''Nutty Professor II: The Klumps''
In the second movie Klump's kind personality is polluted by the Buddy Love gene in his DNA, causing him to occasionally say offensive or insulting things to people without realizing, especially when talking to his new love interest Denise. In an attempt to eliminate this, Klump uses a risky experiment to extract Buddy's DNA from his system, but his plan backfires and results in Buddy manifesting as an independent entity. Klump proposes to Denise, who happily accepts, but Klump gradually begins to lose his intelligence due to the damage his brain cells have sustained as a result of Buddy being extracted from his system. Eventually, he is able to reabsorb Buddy by using a powerful version of his new youth serum to regress Buddy to amniotic fluid allowing him to 'drink' Buddy and regain his old intellect. However, Buddy dies and evaporates into a public coin fountain. Denise and Klump's father, Cletus, arrive just in time to help him when he loses his intelligence. Cletus forces Klump to drink the water from the fountain, which still retains enough of Buddy's genetic pattern, and he regains his intelligence. Later, he and Denise are married.
In other media
Sherman Klump appears in the third season Robot Chicken episode "Endless Breadsticks".
