The Daleks are back, again, and just as useless as before.  This time they have constructed a human detector and use it only to be fooled by a cat and the Doctor, Ian and Barbara hiding under a manhole cover.  The Daleks of the Chad Valley Universe are not the all-conquering evil lumps of hate in bonded polycarbide armour we know from the TV series - or even their dedicated spin off comic strip.  Very disappointing.