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In four, recognised Jac immediately and went for The Zygon Invasion, then spent clues two and three scrabbling around guessing episodes with montages from older stories (The Story and The Engine, then The Name of the Doctor). Finally got it at clue four (and remembered Jac is in that story as well, I only ever remember her being in the Zygon episodes).
This felt like a fever dream, I don’t remember who Jac is and I don’t remember the other Doctors making an appearance Got it in 4, my inner Twissy fan seems to remember that scene perfectly