Also, Christopher Ecclestone in a pre-Ninth Doctor role is in it.

Uh… I think you're confusing The Shadow Of The Scourge (where Ace deafens herself) and Colditz (which has Nazis, but no aliens or spaceships other than the obvious).

Uh, that was Kristoffer Tabori. Norris was G0-T0.

Once he realised time was travelling differently, why not take the TARDIS? Taking the elevator was a stupid mistake.

Haven? That's where I know her from anyway…

Schrodinger's Cat was a thought experiment used to poke holes in Bohr's arguments, not to support it. It's meant to be absurd.

That's not actually how Schrodinger's Cat works, unfortunately.

Fuller came back for the end of three and the start of four. It was only for about seven episodes total, two of which he wrote. You can see his influence with the casting (Swoosie Kurtz and Diana Scarwid, both of whom have a nonzero chance of turning up again here somewhere) too.

But we're told this at the start of the show?

Yeah, this is entirely true. This website is a damn breeding ground for generalisations and weasel words. Tell me more about how something is "trope-y" guys, or how this episode of television is "refreshing", but this other one is just "bland". Just because you state it so, doesn't make it self-evident.

They said they just didn't end up having time to play out the reveal and the fallout, and that they've moved it to the start of the fourth season.

They've said it won't get solved this season.

Dude, Fuller was gone by episode 5.

Uhhh, sure. I mean maybe you've heard something different to me, but I have difficulty believing that he travelled to another country to work with a foreign television channel, specifically to make a show he didn't want to make. That seems like a lot of effort.

"[The Reverend] was a coward who raped everybody."

Both seasons — this and Miracle Day — were filmed in their entirety before airing, meaning that they couldn't get any feedback from anyone but the network, and it's de rigeur network policy to end seasons, particularly premier seasons, on cliffhangers or unresolved plotlines. It's the nature of the beast.

Bring on the James Goss era already.

Look, I'll explain once more, from the top, yeah?

It's super clear with Abby though?

They've deliberately made it unclear because it's meant to be a surprise reveal. That and Abby is only partly possessed — her reckless behaviour is her struggle with being co-opted by a virus she doesn't even know she's succumbing to, not full blown silicon megalomania.