From Raxacoricofallapatorius with Love, on BBC One & Two (UK)
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This is a special episode of The Sarah Jane Adventures, set between series 2 and 3. It's a five-minute sketch that aired as part of Red Nose Day, on March 13, 2009. (But I didn't see it until September 24, 2018, on YouTube.) Sarah Jane, Luke, Clyde, and Rani are apparently working on some kind of upgrade or repair to Mr. Smith, when suddenly the attic begins to shake, and then a man teleports into the room. He claims to be delivering a gift to them from the Galactic Alliance for all they do to protect the Earth. However, it soon turns out he's actually a Slitheen. (The special seems to treat that word as if it's the name of the alien race, which is a somewhat common mistake, largely because no one really wants to have to call them Raxacoricofallapatorians all the time. Besides which, the Slitheen family is who we see most often of this particular alien race, so it's perfectly likely that this one actually is a member of that family, as well.) Anyway, he makes some trouble for our heroes, and even K-9 shows up to try and help them. But it's ultimately Clyde who saves the day.
Well... the whole thing is, of course, completely silly, and probably can't be considered canonical. But it was fun. (Apparently it's even funnier if you're familiar with the British sketch show "The Two Ronnies," which I'm not.)