The Doctor Who 50th Anniversary Special airs on November 23rd, but we'll be seeing Matt Smith's Eleventh Doctor again a little bit early. On November 14th, Smith will appear with Professor Brian Cox in the special The Science of Doctor Who.

Cox will devote the one-hour BBC Two special the science behind time travel, extraterrestrial life, and even TARDIS-like spaces. And, as you can see in the clip below, the professor will be spending a little time with the Doctor:

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The Science of Doctor Who [BBC]