Tybo was transporting Androvax, the "Destroyer of Worlds", when his ship crash-landed on Earth and his prisoner escaped. While Androvax was injured, he encountered Sarah Jane Smith, Luke Smith, Clyde Langer and Rani Chandra. Androvax possessed Sarah Jane and went to Genetec Systems with Tybo and the others in pursuit. To stop Tybo from killing Sarah Jane along with Androvax, Clyde and Rani trapped him in a sealed room. He was freed by other Judoon and was ready to execute Luke and Rani when he met them again. Tybo was able to recapture Androvax after he left Sarah Jane's body.
Because they had saved Earth and helped the Judoon capture Androvax, Tybo decided not to execute Clyde and Rani, but instead revoked their interstellar travelling rights, grounding them on Earth. (TV: Prisoner of the Judoon)