The 1005th Judoon Guard was a Judoon military unit, Captain Tybo was a commander in the guard.
History
Tybo was transporting Androvax, "The Destroyer of Worlds", when his ship crash-landed on Earth. He looked for him down on Earth. When he was injured, he encountered Sarah Jane Smith, Luke Smith, Clyde Langer, Rani Chandra. Androvax possessed Sarah Jane and went to Genetec Systems with Tybo and the others in pursuit. By the time they got there, the Judoon reinforcements had nearly arrived. In order to stop them from killing Sarah Jane along with Androvax, Clyde and Rani trapped Tybo in a electronically sealed room, meaning he was unable call for help. He was eventually freed by the 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.
Due to the fact that they had saved the Earth and help the Judoon capture Androvax, Tybo decided not to execute Clyde and Rani, but revoked their inter-stellar travelling rights, confining them to Earth. (SJA: Prisoner of the Judoon)