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Look who's coming to intergalactic dinner...

Fair to say that River Song has had moderately complicated relationships with previous Doctor Who companions - what with it turning out that she is the daughter of Amy Pond and all - and this first meeting between Mels and Clara Oswald doesn't seem to break that pattern, either.

Sitting down with Madame Vastra and Strax, the two are introduced - although Clara does not seem to be impressed with being identified as the Time Lord's "assistant". Awkward.

To find out why Jenna-Louise Coleman's character is surprised to learn that her new companion is the time traveller she's heard abut from the Doctor, watch the clip in the video player below.

The final episode of the seventh season of Doctor Who concludes tomorrow night, Saturday May 18th - and is on BBC One from 7pm.