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..and a character faces their final curtain!
Spoliers aside, the title of this adventure, which follows on from Eight Truths takes the plot of Metabilis spiders (hence Web) taking over the world (and then the galaxy!) via the cult of the Eight Fold Truth and the stellar convertor.
Stephen Moore is still great as the cult leader, and Lucie gets to have her body taken over displaing her into a cyber space along with growing numbers of alien races as the Doctor races (again) to save humanity and the cosmos at large. Meanwhile we have the Headhunter to deal with as she attempts to play all sides against the middle for profit.
Although when written down in black & white it all seems rather formulaic, this again shines due to casting, acting, script, direction and production. This is a fitting end to a high quality run of eight episodes for the eighth doctor (enough eights!)