This second part of the Vortis two parter from the Give-a-Show Projector is far more faithful to The Web Planet than the first part.  The Doctor communicates with the Animus via the hairdryer and Barbara uses the isoptope to destroy the spidery Animus in the centre.  A very quick version of The Web Planet but the imagery is accurately depicted from the TV story and this story is further evidence of how popular the BBC licencing department wanted the Zarbi to be.