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 Interplantary 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...