A few minutes into Hide it struck me why this run of episodes has been so good - compared to the earlier part of the Eleventh Doctor's stint - Doctor Who has rediscovered its sense of fun.
There may be some minor overarching elements - such as The Doctor trying to solve the mystery of Clara and the wonderful friction between Clara and the TARDIS - but ultimately, Hide was a fantastic, self-contained episode.
If The Rings Of Akhaten (with its stage-set-as-alien-planet vibe) was an homage to the First Doctor era of the show and last week's Cold War was an obvious tribute to the Second Doctor era, then Hide was clearly a Third Doctor story - even beyond its 1970s setting.
The Doctor and Clara arrive at an isolated, rain-lashed Caliburn House where a ghost-hunting couple - reticent war hero Alec Palmer (Dougray Scott) and psychic Emma Grayling (Jessica Raine) - are trying to crack the case of the spectral woman seemingly haunting the mansion.
Starting off as an atmospheric riff on the techno-ghost-hunting of The Haunting and The Stone Tape, Hide very quickly becomes its own entity with a dose of pocket dimensions, bogeyman monsters and a trip from the beginning of the Earth to its end.
Another stellar cast - fronted by Scott and Raine - as well as a solid script from Neil Cross only go to prove that currently the less direct-involvement from Stephen Moffat the better all round it is for the show.
If this was the show's Third Doctor tribute (complete with blue crystals from Metebelis 3), in this anniversary year, that makes next week's its Fourth Doctor (which seems about right):
(The Invasion Of Time, anyone, with an entire episode devoted to a chase through the corridors of the TARDIS?)