Ttomalss was the Race's leading expert on "Big Uglies". He arrived with the Conquest Fleet, and was tasked with finding ways of integrating humans into the Empire. To that end, he oversaw experiments in human sexuality, and made use of human children, raising them as members of the Race. His arrogance made him dangerous enemies among humans and Lizards alike. Nonetheless, his expertise made him invaluable to his species.

Ttomalss secured his first test subject from a Chinese peasant woman named Liu Han. His efforts to raise the baby were exhausting; his species did not have a family unit structure, and Ttomalss had no practical experience in raising even infants of the Race. Liu Han allied herself with the Chinese Communist Party, who made propaganda hay over Ttomalss' act. The Race found Liu Han's actions too costly, and Ttomalss was forced to returned the child, Liu Mei, to her mother.

Ttomalss eventually obtained another child, Kassquit, and raised her in orbit above Earth. Kassquit had felt close to Ttomalss as she grew up, but when she was older she felt resentment toward him for considering her more of an experiment than a family member.

Ttomalss was the Conquest Fleet's leading authority on Tosevite psychology. When the Colonization Fleet arrived at Earth in 1962, he began working with Felless. Despite her having seniority over him, Ttomalss realized she was not as good at studying humans as he was and quickly felt his respect for her as his senior erode.

Ttomalss was briefly assigned to the Race's embassy in Germany. The assignment ended abruptly when he was declared persona non grata for arguing with the Nazi Party platform.

In 1995, after the United States launched the Admiral Peary to Home, Fleetlord Reffet ordered Ttomalss to return to Home as soon as possible to help the Race prepare for the Tosevite arrival. Ttomalss, along with Kassquit and Atvar, was part of the Race's negotiating team with Sam Yeager's diplomatic mission. During the meetings on Home, Ttomalss became increasingly worried about his species being overshadowed by the human race and considered nuclear annihilation as an option for saving the Race. He later doubted this stance, even as the Race on Home were already succumbing to human culture, especially ginger. When the FTL Commodore Perry arrived at Home, Ttomalss was likewise surprised by the humans' technological advancement over the Race. Ttomalss was reunited with Race pilot Nesseref, who arrived on the Commodore Perry, and they talked about the Race's future.

Following the departure of the Commodore Perry, Ttomalss bleakly reflected that it was now inevitable that his species, of all its chauvinistic belief, would be overshadowed by the human race.

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