Caldril

Caldril was the Castellan of the Time Lords. He inherited the role from his father, and aided the Doctor in stopping the Vultures from destroying Gallifrey.

Character History
Caldril was a young Castellan, having inherited the role from his father, who passed away. Caldril was ashamed of the fact that his father had promised to improve the Quantum Ark and not done so, and wished to atone for the sins he had committed. He immediately swore loyalty to the Doctor in his fight against the Vultures, even making his way to the Death Zone to help. n the Death Zone, he accompanied the Shalka Doctor to the Dark Tower, where he, and both Doctors used their psychic abilities to weaken the Vultures, allowing them to be defeated by the consciousness of Rassilon. This proved too much for the Castellan however; the mental strain was too great, and he died in the Dark Tower, having made up for his father's mistakes.

Season 1 (2015-2016)

 * 1) The Sins of the Time Lords
 * 2) The Dawn of Time