The Sixth Doctor is no stranger to courtroom drama, but faces a very different challenge when he prepares to defend a most unusual Judoon.

After an environmental clearance mission goes wrong, Captain Kybo of the Nineteenth Judoon Interplanetary Force is stranded in Victorian England, bound in chains, an exhibit in a circus show. But he has allies: Eliza Jenkins — known to audiences as “Thomasina Thumb” — and the larger-than-life “clown” in the colourful coat.

Uncovering a trail of injustice and corruption, the Doctor and Kybo soon find themselves on trial for their lives…