You'd think poor producer Graham Williams would have learnt from The Power of Kroll that giant monsters aren't that easy to realise but, inexplicably, he allows David Fisher to script a story about a huge, blobby creature stuck down a hole. Said blob is Erato, a kindly ambassador, who has been lured down the pit by the nasty Lady Adastra. With a brief like this, the poor Special Effects Department were always going to struggle, but the result is still jaw-droppingly awful. It's as if someone asked Victor Frankenstein to create a giant balloon creature out of some white bin liners. However, it gets worse. Erato also possesses a 'probe', a large boner that wobbles about in front of him. Tom Baker seems particularly enamoured of Erato's schlong, even blowing down it at one stage. Seriously.