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The series has not been consistent in depicting how Time Lords come to be. The classic series suggested the Doctor had to attend an academy, and "The Sound of Drums" described a ritual involving a young Doctor and young Master being forced to gaze into the untempered schism of the Time Vortex. However "A Good Man Goes to War" and other modern-era episodes have established that Time Lord is a species with its own DNA - or that all Gallifreyans are Time Lords - which would mean the Doctor was born a Time Lord.