TV

Battlestar Galactica [2004]
2x06 Home Part 1
2x07 Home Part 2
2x08 Final Cut
Guest starring Dexter's dad!
Also: if all of the Colonies' paper, photos, cards, etc -- and, most pertinently, video recordings -- are octagonal (as opposed to our use of quadrilaterals) then why are their TVs and monitors still rectangular? ("Because production design didn't think it through," is the real-world answer, of course.)

Damages
3x12 You Were His Little Monkey
All the threads are, of course, coming together just in time for the season (and, possibly, series) finale.

Doctor Who
31x13 The Big Bang [season finale]
See here for my thoughts on this episode.
[Watch it (again) in HD on iPlayer.]