Vael Voryunsti Sheverell was the Quantum Theorist of the Time Scaphe.
Vael was born to a family of merchants who resided in Soonwell Valley. An Individual, Vael did not adjust well to being set apart from his people and became an embittered and angry young man. He entered the Academia as a Young Hero cadet and studied temporal physics, but didn't fit in. He disliked his fellow cadets and played truant from lectures as often as possible. He failed his final assessments (except for temporal manifold physics) and in a fit of rage accidentally killed fellow student Loie with the full force of his mind. The Pythia, knowing of his power and having foreseen that the next ruler of Gallifrey would be a male, chose Vael as her successor. Although Vael supported the Neo-Technologists, believing he was destined for greatness and wanting to rule Gallifrey, he agreed to be the Pythia's agent.
The Court of Principals made Vael a crew member of the Time Scaphe, replacing the deceased Taspar, but he sabotaged the test flight as he didn't felt welcomed by the crew, sending the time machine out of control. It collided with the Doctor's TARDIS, activating its Banshee Circuits and causing it to reconfigure itself into a SARDIT, transforming it into a multi-dimensional city that curved into itself. After meeting the Seventh Doctor, he tried to seize control of its TARDIS. Angry that he couldn't kill the Doctor and determined to be free of the Pythia, who tried to infiltrate his mind to known where he was, Vael turned his power against him, incinerating himself. (PROSE: Cat's Cradle: Time's Crucible)