Bingowings said:

There is another related species of cyborg (which I shan't spoil with details here) who are basically insane children who kill for fun.

Thanks for that, I know I'm asking a lot not spoiling potentially 50 year old information. ;-)

Ovan Marekal said:

Trust me, doubleo, by midway through Series 3, you'll wish Rose Tyler had died during "Doomsday"; by the end of Series 4, you'll be wishing she'd died at the end of "The Parting of the Ways" rather than Nine...

That's interesting. I'm not sure what this means at all, which makes it even MORE interesting.