2nd Dr. - "No, of course not, but a... but a... but a whole galaxy to explore? Millions of planets? Eons of time? Countless civilizations to meet?"
(The War Games)

4th Dr. - "I claim the presidency of the Council of Time Lords!"
(Invasion of Time)

2nd Dr. - "Well, yes, it's quite close, isn't it? (He sees the Brigadier looking around the console room in disbelief). Oh you'll soon get used to it, old chap. Relative dimensions and all that."
Brigadier: "So this is what you've been doing with UNIT funds and equipment all this time. How's it done, some sort of optical illusion?"
Second Doctor: "Oh, no, no, no. They come like this, really."
(The Three Doctors)

4th Dr. - "There you are, so sorry."
(Stones of Blood)

Warning! Hard Hat Area

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