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Professor Membrane is a world renowned scientist who has invented many marvelous inventions, including Super Toast, which is a popular breakfast food. He is also the host of his own scientific television program, Probing the Membrane of Science, which is one of the top rated shows throughout the world and people need to pass rigorous exams to even be considered to be an audience member on the set. However, due to his excellent scientific ability, he often neglects his children and he can only devote one day a year to actually spend some quality time with them, as in most instances, the Professor Membrane that his children know only exists in floating screens and various other visual representations. Despite all of his flaws, his children do care about him and they take pride in being his son, though Gaz in particular wishes that he would be able to spend more time with them. Professor Membrane tends to have a calm and collective personality at all times, though he has an undying hatred for Santa Claus since he was betrayed by him in the past, though Professor Membrane has decided to let someone else deal with Santa Claus as he is far too busy trying to delve deeper into science.

Almighty Tallest Red is one of the current Tallest in the Irken Empire. Due to his incredible height, he would have been the only Tallest selected, though since Purple was equally as tall as he was, the two were forced to share equal power as the Almighty Tallest. Red tends to be a more outspoken leader than his counterpart and he tends to have more intelligence and leadership skills, though he has at times lost track of what he was talking about and Purple has had to correct him on several instances. It was Red who came up with the idea of sending ZIM to planet Earth as an Invader and it was Red who came up with the idea to give ZIM a defective SIR unit, though Purple had helped supply some of the components used in GIR’s creation. Despite his credentials as a leader, Red tends to enjoy taking things easily in most circumstances, as he enjoys consuming snacks, like his counterpart, and he often works with Purple in order to play jokes on some of their subordinates. However, despite his position in the Irken Empire, Red isn’t the true leader and he merely does what his is permitted to do, though even in such, he is proud to be an Irken and he usually is the one who calls the shots onboard the Massive, the Irken Imperial Flagship.

Almighty Tallest Purple is one of the current Tallest in the Irken Empire. Due to his incredible height, he would have been the only Tallest selected, though since Red was equally as tall as he was, the two were forced to share equal power as the Almighty Tallest. Purple tends to be slower witted than his counterpart and he loses his cool quite easily in most circumstances, especially during battle. Even though he isn’t the best leader, he is still well respected through mandate and he does have equal power as Red, though he merely chooses not to use it as often as Red does. However, Purple loves puppets and on probing day, Purple demands that all Invaders who wish to pass the assessment put on a puppet show, in which Red agrees with and the two often enjoy watching them together. In their spare time, Purple and Red like to play jokes on some of their subordinates, though mostly at ZIM, as they believe his condition is fairly entertaining as he isn’t a real Invader. Despite his position in the Irken Empire, Purple isn’t the true leader and he merely does what his is permitted to do, though even in such, he is proud to be an Irken; though he mostly spends his time consuming as many snacks as possible onboard the Massive, the Irken Imperial Flagship.

Ms. Bitters is the teacher of Zim and Dib. She doesn't teach much, rather she goes about trying to make her student lives as miserable as possible by telling them ways the might die. It has been confermed that Ms. Bitters is neither human or Irken, but an unknown species. She dispises emotions. She apearently had a miserable childhood, as dippicted by flashbacks on the show.