Daleks, Cybermen, Judoon, Sontarans and various other enemies of the Doctor show up and they have a plan. Amy is worthless and fights a Cyberman's head. The Cybermen quote the Borg. Rory shows up back from the dead or is he? Bad things happen to various people and there is a creepy final image. I cannot see how the next episode can resolve this.
"Arise Roman person."
"What could inspire that level of fear?"
"A nameless terrible thing, soaked in the blood of a billion galaxies. The most feared being in all the cosmos and nothing could stop it or hold it or reason with it. One day it would just drop out of the sky and tear down your world."
"They'll never expect three people to attack 12,000 Dalek battleships cos we'd be killed instantly."
"We've been playing host to Cleopatra, who's in Egypt and dead."
"It's just like being an organ donor except you're alive and sort of screaming."