Derek was a student at St Luke's University.
He once argued with the Twelfth Doctor during his lecture about cyclical time. Bill recalled that, following this, Derek couldn't walk past the lecture hall without twitching. (PROSE: Diamond Dogs)
New to Doctor Who or returning after a break? Check out our guides designed to help you find your way!
READ MORE
Derek was a student at St Luke's University.
He once argued with the Twelfth Doctor during his lecture about cyclical time. Bill recalled that, following this, Derek couldn't walk past the lecture hall without twitching. (PROSE: Diamond Dogs)