Apprentice Time Lord

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You may be looking for Junior Time Lord.
Romana I. (TV: The Ribos Operation [+]Loading...["The Ribos Operation (TV story)"])

Apprentice Time Lords were recruited by the Celestial Intervention Agency to travel through space and time, to change circumstances that could have led to universal disaster. The Inner Council appointed Romana I to serve as Apprentice Time Lord to the Fourth Doctor in the first quest for the Key to Time. (PROSE: A Sourcebook for Field Agents [+]Loading...["A Sourcebook for Field Agents (novel)"])