A high ranking Irken scientist, Tsnee Membrane came to Earth with a simple goal in mind. To find Invader Zim and use him as a weapon against the tallest. Red and Purple as they have taken to calling themselves and the control brains are leading Irk to Ruin.

Initially her plan was to find and recruit him, convincing him to prove himself to the tallests by conquering all of Irk in his own name but as she spent more time it became clear she'd need more than one irken rebel on her side. She and her research assistant Tich moonwaterart find Invader Tak and after a bit of persuasion manage to convince her to turn her anger atleast in part towards the empire that shunned her.

In addition, she became Zim's new mother as her cover and as part of her invasion plan, began romancing Professor Membrane to gain an in to the tech of Membrane Labs. As time went on though, a problem arose. Her cover was becoming harder to separate from the mission. Her feeliongs for Membrane became very real and she even began to care for Zim and Tak as though they were her actual children. Even her maternal facade for Dib and gaz became more and more real.

Tich saw this as a weakness but Tsnee turns this into a new fire and motivation for her mission to make the galaxy better for her found family and Tich even eventually comes around. With the might of Earth's greatest mind and Irk's greatest invaders, she finds herself poised to accomplish her mission and become tallest.

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