It's not all bad though. I like the Doctor's faith in humanity and his horror at Ambrose's (Nia Roberts) murder of Alaya (the Home Reptilia). Alaya, who like her 'genetic sister' is a Warrior, wants war with the apes and has spent time goading everyone - including the Doctor - into killing her in order to start a war. It's a sort of suicide for genocide. A reverse Spock.*
Alaya and Restac are both played by Neve McIntosh who has since gone on to be the Homo Reptilia of choice as Madame Vastra. Both her characters in this are of a nastier, more murderous inclination. They don't like apes and they want their planet back. They're not afraid to bump off members of their own race to do it. Or die. The end justifies the means.
McIntosh is pretty great actually.
Being a 'Silurian' story we get echoes of previous stories and a wiser, more peaceful Elder Eldane (Stephen Moore) is the other side of the Silurian character. He's looking for a peaceful solution to the problem. It's is Eldane's reaction to Alaya's death that convinces you that this will not end well. But in the end - and without much in the way of explanation as to why - Eldane trusts the humans and the Doctor enough to force his people back into suspended animation. Woo-hoo.
The guest cast is small and initially the two-part story looks like it is going to give us room for character development but then woosh it rushes away with itself so Meera Syal's Nasreen Chaudhrey realises that she loves Robert Pugh's (who I love btw - brilliant actor) Tony Mack but the whole thing seems as rushed in the end as Leela's departure in The Invasion of Time.
Oh but a big round of applause to Samuel Davies as Elliot for being a child actor in Doctor Who that isn't actually really annoying.
To cut this ramble short there's a good story in here somewhere with good characters but it doesn't quite escape from being squeezed by the need to fit a story arc. A decent-ish first episode is hamstrung by a rushed and disappointing second. Not horrible. Just eminently forgettable.
Oh and oh. Er, if this drill is has reached the furthest into the Earth ever then why isn't the planet screaming out its rage. Has nobody heard of Inferno.
*I knew what I meant by this when I typed it. I may have lost it afterwards but these are meant to be stream of consciousness, immediate reaction blogs so...and I still think I know. Sort of. Ish.