of the machines in the lab temporarily altered his personality – effectively killing her. When the Doctor presented in his defence the future events of Terror of the Vervoids, he began to suspect that the Valeyard was tampering with the evidence – having reviewed the evidence before presenting it and noting some differences between what he had witnessed then and what was now being displayed – but lacked proof. The Doctor was shown being forced to destroy the human-plant hybrids known as the Vervoids when they ran rampant on a space liner. If they had been allowed to reach Earth, they would have eliminated all animal life. The Valeyard argued that this meant the Doctor had committed genocide. In The Ultimate Foe, the Master appeared in the Matrix, revealing that it was possible to infiltrate it. Sabalom Glitz and the Doctor's future companion Melanie Bush were presented to the Court to rebut the Valeyard's accusations. It was then revealed by the Master that the Valeyard was, in fact, the Doctor himself – or rather, an amalgamation of the darker sides of the Doctor's nature, from somewhere between his twelfth and final incarnations. This concept is similar to the ethereal "Watcher" that manifested itself to bridge the gap between the Doctor's fourth and fifth incarnations (Logopolis). However, in the novelisation of the story the Master states "The Valeyard, Doctor, is your penultimate reincarnation... Somewhere between your twelfth and thirteenth regeneration". The Valeyard was also revealed to be acting at the behest of the High Council of Time Lords to cover its corruption in the Ravalox affair. The "secrets" that Glitz had been seeking were information from the Matrix. Ravalox was Earth in approximately 2,000,000 AD, but the Time Lords moved it through space, killing virtually every human being living on it. To prevent the Doctor discovering the secret and revealing it, they used the Valeyard to try to have the Doctor executed under the pretence of a trial. The reward for the Valeyard's actions would have been to give him all of the Doctor's remaining regenerations and make his existence concrete. However, the Valeyard would then have slain every member of the Court as well, using a particle disseminator located within the Matrix. The Doctor entered the Matrix and fought and defeated the Valeyard in a fictional world of his creation. The Inquisitor revealed that Peri had indeed survived and was