Transduction barrier
Talk0The transduction barrier protected the Time Lords' planet of Gallifrey from invasion. Effectively, it was a force field.
The barrier was deactivated on the orders of the Fourth Doctor. This allowed the Sontarans to invade Gallifrey. (TV: The Invasion of Time) A squad of Daleks which infiltrated Gallifrey lowered the transduction barrier, allowing them access to Gallifrey to invade. (AUDIO: The Apocalypse Element)
In an alternate timeline, the Knights of Velyshaa breached the barrier and invaded Gallifrey. (AUDIO: The Sirens of Time)
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