Now this is more like it! The episode is set in a dystopian future in which New New York has been devastated by a plague, leaving the citizens scrapping an existence below trapped. However their computers convince them nothing has changed and they continue to live life as normal. This has lead to Gridlock on the motorway as the exits have shut and the traffic just goes in one big loop. A 23 year long traffic jam... hell on New Earth!
Living below are the Macra, sustained on the exhaust fumes, who pick off those foolhardy enough to use the fast lane.
Martha is kidnapped by a couple who want to car pool so they can use the multiple occupancy fast lane (2000AD eat your heart out!). Doctor lead fun ensues.
And in the midst of this the Doctor meets two old friends and finds out "He is not alone".
This episode is not only the 727th (meaning Doctor Who now has more episodes than the entire Star Trek franchise) but probably the best of the season so far. I'm not too keen on the Face of Boe nor of the continuing references to Rose (Adric died and the Doctor barely mentioned him, for shame!) but the story was great, Martha is a brilliantly strong companion and David Tennant is awesome. An elderly lesbian couple and the Doctors drop through (yes through) the cars added the necessary wackiness.
Travis Oliver sure added a certain something as well...