A Doctor Who mini episode named Time was released by the BBC for the charity event Red Nose Day

Doctor Who: Time, Part One – Red Nose Day 2011 – BBC Comic Relief Night

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Doctor Who: Time, Part Two – Red Nose Day 2011 – BBC Comic Relief Night

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SPOILER: Yo dawg, I herd you like the TARDIS, so I put an TARDIS in your TARDIS so you can step in the TARDIS while you are inside the TARDIS