Aku's Evil Scientists were Aku's corrupt but brilliant think tank who were responsible for helping to create and design the X-Models, the Beetle Drones in Aku's Army, and presumably many of Aku's other technological weaponry.
It was unknown how Aku's destruction in the past affected their careers, since there was no Aku to order them to make robotic servants for him, not to mention their own existence, in the future.
Known Scientists[]
Aku's First Scientists[]
Aku's first think tank operated some time during the early years of his reign and were responsible for creating the first line of Beetle Drones and the X-Models. They were all rather unique in appearance, appearing to be middle-aged humans with vastly varying appearances, heights and hair colors.
The Funny Scientist[]
The group's most notable member was an individual simply referred to as "The Funny Scientist" by X-49, who was responsible for creating a unique emotion chip and installing it into X-49 for reasons that made sense to no one but the scientist himself, with X-49 simply commenting that "he was funny like that". The emotion chip proved to be a hindrance to X-49 as emotions made it difficult to carry out his programming as a killing machine, but in the end this chip also proved to be a blessing which endowed X-49 with a will of his own with a genuine love for life and especially his dear sweet pet Lulu.
The Escaped Scientists[]
Not all of the scientists who served under Aku were evil though, as one notable collective of Scientists who operated some time after the first generation think tank, were unwillingly forced by Aku to create robot armies and evil technology for him and these would be the first of Aku's scientists that Samurai Jack himself would meet. These scientists no longer wished to serve Aku and planned to escape Earth, and thanks to Jack, their attempt was successful (Episode V: Jack in Space).
Out of all of them, only a few had their names and positions revealed, mainly Sergei (the crew's mathematician), Frederick (a cowardly scientist), the Technician (equipment expert and the only female scientist), the Idealist (the youngest and most creative), and the Analyst.
Extor[]
Extor was another unwilling recruit who was ordered by Aku to design the Ultra-Robots, which were without a doubt one of the most powerful robots ever used by Aku, especially since they were powered by Aku's own essence. Extor was a good-natured man who just wanted to protect his village, and betrayed Aku in order to destroy his evil creations.
Aku's Evil Scientists (50 years later)[]
Aku's scientists 50 years after Jack arrived in the future.
Some 50 years after Jack first arrived in the future, Aku had a new team of scientists who were responsible for creating a more deadly upgraded version of the Beetle Drones, however Aku had long since lost interest in hunting down the samurai and had been hiding away in his tower preferring not to be disturbed, but he still allowed the scientists to hunt down Jack of their own volition, something one of the scientists seemed to take delight in.
Notably, this generation of scientists were represented by a man who bared a notable resemblance to "The Funny Scientist", even having the same mustache and color scheme as his predecessor, but whether a connection exists or not is unknown.
Inventions[]
Beetle Drones[]
Alongside Aku, the scientists were said to have created the Beetle Drones as an upgrade from the X-Model assassin robots, however, X-49 (correctly) believed them to be inferior to the X-series (Episode L: Tale of X-49).
In exchange for their technical services, Aku provided them with resources and materials to create his robot army and henchmen.
A massive army of their Beetle Drones were single-handedly slain by Jack in one of his most heroic efforts; that was one of the only times that the Beetle Drones were nearly effective in killing Jack (Episode III: The First Fight).
Later, despite having fifty years to perfect their designs, their robots were still just a minor inconvenience to Jack, when Jack used his electronic polearm to impale their largest and most powerful beetle drone to date, only for it to explode without landing a single hit on Jack (Episode XCIII).
The drones were likely erased from existence after Aku's destruction in the past.
X-Models[]
In Episode L: Tale of X-49, the scientists were seen perfecting the design that would become the X-series of assassin robots. One scientist installed an experimental emotion chip inside of the robot X-49, which caused him to outlive the rest of the X-series, only to be destroyed by Jack due to his emotional hubris. They were likely erased from existence after Aku's destruction in the past.