Sunday TV: 'The Killing,' shark week begins

Air Jaws: Countdown to Shark Week | Discovery, Sunday, 8 ET/PT

It's shark week – and as any self-respecting shark week fan knows, that means hours and hours of footage of great white sharks breaching in slow motion, the better to chomp on some poor, unsuspecting seal. Indeed, Discovery has become so fond of these "air jaws" shots, it's opening the week with a special devoted to them that includes a preview of another upcoming air jaws special. It's followed by the two-hour special Megalodon: The Monster Shark Lives (9 ET/PT) and the debut of Shark After Dark (11 ET/PT), a live late-night talk show hosted by Josh Wolf that will run each evening during shark week.

The Killing | AMC, Sunday, 9 ET/PT

This once higher-profile series ends its season with a two-hour finale. Considering the blow-back The Killing took the last time it ended a season without ending its story, you can pretty much count on it ending its story.

Falling Skies | TNT, Sunday, 10 ET/PT

Robert Sean Leonard guests in the season finale, as the 2nd Mass destroys a crucial alien base and the Mason family is reunited. Sounds like a happy ending, right? Not so fast, people -- those skies are still falling.