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•We've come to the end of the road for Prison Break(Fox, tonight, 8 ET/PT), an intriguing concept that has long since stopped being intriguing. Which is what tends to happen when networks insist on stretching miniseries ideas out to series proportions. Still, if you've stuck with the show this long, let's hope you get an end that satisfies.

•This is a big weekend for seasonal departures, but there are a few season premieres as well, led by the BBC America return of the cult favorite Primeval(Saturday, 9 ET/PT). Look for more monsters, a few new cast members and a rare-for-TV trip to the British Museum.

•It's time once again for Survivor (CBS, Sunday, 8 ET/PT) to crown a new, well, survivor. You get two hours for the victory march, and then a final reunion hour as a recap.

•Desperate Housewives(ABC, Sunday, 9 ET/PT) wraps up with a two-hour special, as Bree's divorce hits a speed bump and Dave threatens to make good on his plan to kill little MJ (which surely the show won't let him do). The last few weeks have dragged a bit, in part because Dave's secret plan — never much of a secret — was revealed too soon. Still, overall it's been a very strong season, which will end, with any luck, with an equally strong finale.