The Thazkans were a species that were tall and beautiful and had wings.
The Thazkans invaded the Rentali planet and enslaved and killed the Rentali. They were eventually defeated by the Rentali and several other species who were acting to prevent the Thazkans from invading their planets next.
Nine hundred years later, the Thazkans and Rentali were still at peace, but an anti-alien movement had begun to arise in the Thazkan government and among its people. Professor Stamis tried to warn his people of the horrors of the holocaust, but he was ignored. He took the drastic step of leaving his family and began making speeches denying that the holocaust had taken place. The Rentali anger over his claims helped to convince the Thazkan government to change their anti-alien stance. (PROSE: Denial)