It's a big night for finales on cable TV, as Dexter wraps up its second season and Extras finishes its run forever with a movie-length special.

(Side note: If these two shows were a celebrity couple, everyone would totally call them "Dextras." OK, moving on.)

The Extras movie is packed with guest stars, but it has a lot more going for it than that. The special picks up a year after the second-season finale, with Andy acting even more obnoxious than usual. As funny as Extras can be, at least one critic who's seen this special says it's dark and mean-spirited — but wonderful. Anyone who saw Ricky Gervais and Stephen Merchant's somewhat dismal and yet completely fantastic sendoff to the British version of The Office probably won't find that surprising. HBO has a preview interview with Gervais and Merchant with a few scenes from the show.

Dexter, meanwhile, finds Lundy and the FBI closing the case of the Bay Harbor Butcher — but that doesn't mean Dexter's out of the woods yet. In case you're not already in enough suspense, you can watch a scene from tonight's finale right now if you just read more.

Photos courtesy of HBO and Showtime