Egon Spengler Egon Spengler is a LEGO Ideas minifigure released in 2014 . He is based on the " Ghostbusters " character played by the late Harold Ramis . In the film Egon creates most of the Ghostbusters technology such as the Proton Packs , PKE Meter , and the Ghost Traps . Egon Spengler also appears in LEGO Dimensions , and the 75827 Ghostbusters Firehouse Headquarters . Background . Egon is bookish and socially awkward . In his spare time , he collects spores , molds , and fungus . He doesn ' t articulate his emotions well and has described himself as " always serious . " His childhood may have been normal in many regards , but one strange fact is that he didn ' t play with toys . Egon said that his parents did not believe in toys . He was given part of a Slinky once , but he straightened it . And once , in Ghostbusters II , Egon flatly informed Mayor Lenny ' s porter that the Proton Pack was not a toy . Despite Janine Melnitz ' subtle hints that she was attracted to him , he seemed to ignore her romantic advances , kept quiet , and their relationship remained platonic . Egon doesn ' t handle stressful situations well , as evidenced by his statement that he was " . . . terrified beyond the capacity for rational thought , " when facing the Stay Puft Marshmallow Man . Egon is not without a sense of humor and has been known to be sly . Such as after the Ghostbuster ' s first case , when he holds up his fingers to show the amount of the bill to the Sedgewick Hotel , and during the court trial in 1989 , when he chimes in from " Doe , Ray , Egon ! " and then grins mischievously . Occasionally Egon is given to understatement ; he initially only states that crossing the streams would be " bad " . Egon has a very dry sense of humor , once jokingly stating that most women would be " more interested in his epididymis , " rather than his intellect . He is not immune to anger , as under duress he has been shown to swear twice in the first movie . He even lunged at Walter Peck in anger when Peck ordered them arrested for the disruption regarding the shutdown of the containment grid , despite the fact Peck himself was entirely responsible . He will also on occasion smirk and give a wisecrack ; such as during their encounter with the Opera Diva ghost in the Ghostbusters : The Video Game Egon says " The fat lady ' s singing ! " And while exploring Central Park ' s Cult Cemetery , Peter says " This isn ' t the Central Park I ' m used to . " to which Egon replies , " You still have your wallet ? " Generally speaking though , Egon remains largely pragmatic and straight - to - the - point when it comes to his demeanor . Even though he has a tight and awkward personality , he is still the brains of the team . Egon puts few restraints on the scope of his paranormal research . This is evident in Ghostbusters II , as he conducts experiments in his lab in which he deliberately incites couples to argue . When the mood slime is being tested , Egon sleeps with it in order to check its response to nurturing behavior . Science tends to take precedence over people ' s well being , as Egon is rather detached in his instructions regarding psychological experiments with couples and children in the second movie .