Master's Horsebox

Horsebox parked near Rossini's caravan at the circus hides the Master's operations. Jo spots Professor Philips slip inside, marking it for suspicion. The Doctor steals a TARDIS circuit from within. Brigadier reports it vanished with Autons during UNIT's raid, amid generator hum and distant calliope. Closed doors conceal gear amid carnival bustle; raid chaos leaves its secrets unresolved.