Ceneca-10050 was the High Magistrate of the Bem Tribunal Magistrate of Planet Argentium. As magistrate, Ceneca-10050 was responsible for putting on trial individuals accused of "criminal disobedience" against the Argentium High Command.
At the trial of Ceneca-9009, Ceneca-10050 presented the evidence that Ceneca-9009 had violated direct orders of the High Command by de-robotizing all beings on Mobius instead of robotizing them. Despite objections by Sonic the Hedgehog, Ceneca-10050, along with the Magistrate, found Ceneca-9009 guilty and sentenced her to be executed at the start of the next planetary roll.
However, Ceneca-10050 privately believed that Ceneca-9009 did not deserve such severe punishment, pointed out that many people agreed, and that her recent actions on Mobius had not only been correct but had also helped balance out the tragedy that Ceneca-9009 had caused on Biotex thousands of years earlier. Ceneca-10050 approached Sonic, Amadeus Prower and Rosemary Prower outside the courtroom, offering to help Sonic rescue Ceneca-9009 and get them all off planet and back to Mobius. While Sonic rescued Ceneca-9009 from prison, Ceneca-10050 obtained a spaceship. Unfortunately, it was only able to carry one person. Sonic used it to return to Mobius, but the Bem authorities believed that Ceneca-9009 had fled, so that they wouldn't bother searching for Ceneca-9009 on Argentium. (StH #129)