So, script excerpt and clip from a wiki article worked last time, and I am lazy, therefore why not do it again…
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3×07 The Empty Planet: The TARDIS returns to Colin’s native time to investigate an alien transmission, but the exact date rings a bell for Sammy. Moments after stepping out of the TARDIS, every living thing on Earth vanishes, aside from the Doctor’s two companions and a lonely young boy. Why were they spared, and can they rescue the people of Earth before time runs out?