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Crozier was a scientist who committed his life to perfecting the control and alteration of behaviour. In return for funding, he dedicated himself to saving Lord Kiv.
Crozier was born after 2339 (Mindwarp) and, at an unusually young age, became a doctor and a scientist. (Mindwarp) By his late thirties, he had a daughter named Cordelia, who followed in his footsteps and became a scientist herself. (Antidote to Oblivion)
Crozier was summoned to Thoros-Beta to help Lord Kiv in 2379 in return for funding for his work, also being threatened with death should he be unsuccessful in saving the Mentor’s life. He was assisted by Kiv’s most trusted servant, the Matrona. In his attempts to discover how to transfer Kiv’s mind into another body, he experimented upon the Raak, making it docile against its nature. He also attempted to alter Yrcanos’s mind to the financial benefit of the Mentors.
When the Sixth Doctor arrived on Thoros-Beta, Crozier subjected him to the helmet to interrogate him. This affected The Doctor’s personality and seemingly made him sympathetic to the Mentors, becoming Crozier’s assistant. Crozier seemed to successfully transfer Kiv’s mind into Peri Brown’s body, after which Yrcanos killed both her (Mindwarp) and Crozier. (Mindwarp) However, this was a lie told by the Matrix. (The Ultimate Foe)
In reality, the transfer was a failure. (Antidote to Oblivion) Peri survived and left with Yrcanos (The Ultimate Foe) whilst Sil killed Crozier and told Cordelia that his death was the fault of the Doctor. (Antidote to Oblivion)
In 2379, Crozier was in his late thirties. He had blond hair and blue eyes so pale that they were almost colourless. (Mindwarp)
Crozier devoted his life to perfecting the control and manipulation of behaviour. His manner was abrupt and showed a dismissal of anything and everything aside from his scientific passions, which included his fixation upon his study of the brains of creatures that possessed or could be given the power of reason. He held contempt for those that he deemed to be barbarians, including the Krontep. (Mindwarp)