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The Doctor interrupts a casual chess match between Tegan and Turlough when the TARDIS power readings reveal an unexplained drain. While his companions dismiss it as a leak, he realizes …

The Doctor abruptly halts his investigation after detecting energy draining from the TARDIS. White Guardian’s voice cuts through as a garbled transmission, escalating to a clear command to increase power …

The White Guardian's urgent transmission to the TARDIS is violently interrupted by the Black Guardian's interference as Tegan struggles to maintain contact. The Doctor and Turlough burst in just as …