And so, with the advent of this final two-parter, series 4 of The Sarah Jane Adventures comes to a rip-roaring conclusion as the Doctor’s favourite journalist/alien investigator is pitted against her ultimate enemy…old age! When a meteor falls to Earth, Sarah Jane, Rani and Clyde investigate the crash site, only for their rescue mission to be upstaged by the intervention of one Ruby White. Ruby’s a more kick-ass (and noticeably younger!) version of Sarah Jane, replete with her own house on Bannerman Road, a flash sports car and her own (handheld!) super computer named Mr White. Initially hostile to Sarah Jane and her fellow ‘amateur’ alien hunters, relations are thawed after Sarah Jane begins to show signs of poor judgement, and endangers Clyde and Rani during an alien attack. Rather fortuitously it’s Ruby who steps into the breach again and saves the gang from certain death. Worried about her unsuitability to continue investigating alien activity, Sarah Jane hands over all of her equipment (as well as access to Mr Smith) to Ruby, who she also entrusts with looking after Clyde and Rani. However, Ruby isn’t all she appears to be, and Sarah Jane’s symptoms have far more sinister origins than just the ravages of time… Played with lip smacking glee by Julie Graham, Ruby is revealed to be an alien Katesh, a devourer of excitement and thrills who’s comes to Earth to seek out the most exciting life on the planet (no prizes for guessing who’s that is!) and consume it. However, with Ruby’s plan to replace and devour Sarah Jane revealed, the villainous Katesh’s path to victory is blocked by the return to Ealing of a couple of familiar faces. However, despite all the high-energy goings-on this is a story that very much highlights and plays to the strengths of the series’ most potent, and often overlooked, weapon – Elisabeth Sladen. Playing a version of Sarah Jane who is at once frail, failing and seemingly afflicted with dementia, her performance in the first part of this story in particular is especially strong. Given some of her strongest material on the show to date, Sladen grabs the opportunity that Hickman and Roberts have given her and runs with it. It’s the culmination of an increasing relaxation of the Sarah Jane character that seems to have been occurring since the second half of series 3. Now freed from the need to mother the character of Luke, the Sarah Jane of 2010 seems to resemble far more closely the character we grew to love back in stories such as Pyramids of Mars and The Hand of Fear than at any point since her return to the airwaves in 2006. It’s a subtle shift, but a welcome one as the sometimes overly earnest Sarah Jane of series 1 and 2 was – for this writer, at least – starting to wear a bit thin. However, for my money the real stand out performer in series 4 has been the ever improving Anjli Mohindra, who has noticeably blossomed as an actor with the increased responsibility that a smaller cast has brought. Daniel Anthony and – in a reduced role – Tommy Knight have both turned in decent work too, but it’s Mohindra who’s caught the eye. And – regardless of the future of the series – I’d imagine in simple career terms her stay on Bannerman Road may not last past series 5. All in all, Goodbye, Sarah Jane Smith brings a mostly excellent fourth series to a fitting close. It hints at further stories to come (anyone willing to start a book on whether Julie Graham’s Katesh returns in series 5?) while also drawing certain strands to a natural conclusion. Read our review of the episodes 9 & 10, Lost In Time, here. Follow Den Of Geek on Twitter right here.