The Mind Robber reminds me a lot of The Celestial Toymaker, yet a much better version of it.  On the one hand, both stories are creative.  Plus, The Mind Robber has better, and makes much better use of its companions.  Jamie and Zoe make for highly effective a highly effective TARDIS team with the Second Doctor.  Production also puts a lot more effort into production, so The Mind Robber looks great and holds up a lot more than The Celestial Toymaker on every front.

In both stories, we face these larger than life threats that are imaginative and very creative.  The Land of Stories is a very cool setting that shows just how different the setting of the Doctor Who universe can be.  With all that being said, this feels like a longer serial than five episodes, and that definitely has something to do with how repetitive this story can be.  At a certain point, we get it, and it feels a little drawn out after a while.  I did like the stuff with Rapunzel, that was pretty silly.