No Tricks

"No Tricks" is the third episode in the eighth season of Doctor Who, set on the planet of Caltaxi during the Intergalactic Fair in the distant future, where the sinister Grand Puppeteer is up to something far more dangerous than mere shows.

Synopsis
The Doctor and Billy respond to an invitation to the distant planet of Caltaxi, where the Intergalatic Fair is underway. Here the sinister Grand Puppeteer has created the ultimate puppet, a living animated creature, called the Homogenous Harlequin (similar to Mr. Quin in the Fourth Doctor adventure Talons of Weng-Chiang). Can the Doctor unmask the Puppeteer and his dark intentions?

Intergalactic Fair
The major attraction for all species and terrestrial lifeforms in the distant future, the Doctor has visited the Intergalactic Fair numerous times before. He expresses interest in the various attractions, but becomes suspicious of the supposedly harmless Grand Puppeteer.

Continuation and reference

 * The Grand Puppeteer claims to his crowd that his show is the "greatest show in the universe", prompting the Doctor to recall his adventure in his seventh incarnation.
 * The Grand Puppeteer, in his dying moments, tell this Doctor that: "He will break you", referring to the main Season Eight story arc.