Heads-up, “Supernatural” fans: Contrary to what your TV listings may say, tonight’s all-new episode, along with the new “Smallville,” is being bumped to next week. Long story short, after all the hype for its “Catch VD” ad campaign, Thursday’s all-new “Vampire Diaries” was pre-empted in Chicago and Baltimore, and The CW doesn’t want to miss out on those ratings. So that and “Nikita” will repeat tonight, with tonight’s regularly scheduled shows airing next Friday. Got it? (If not, get a lengthier explanation here.)

Watch it

“Onion News Network” (7 and 10:50 p.m., IFC). Tonight: Snowlocaust! Last week’s debut of this mock newscast was much funnier than I thought it would be. Very sick stuff, and worth checking out.

“Portlandia” (7:30 and 11:20 p.m., IFC). And this new hipster comedy was pretty much what I expected: A hit-and-miss series of sketches, some very funny, some falling flat. But it’s entertaining enough overall. Tonight, Kyle MacLachlan guest stars as the mayor of Portland, who hires Carrie and Fred to write a theme song for the city. One that doesn’t sound like it was made in Seattle. (The real mayor of Portland guest stars as MacLachlan’s aide.)

“Fringe” (9 p.m., Fox). Massive Dynamic assembles the Doomsday Device. (Um, excuse me . . . . why?) And Walter gets more and more concerned with Peter’s role in the device. (Which again begs the question: Why assemble it?!?) BTW, “Fringe” did very well in the ratings in its new timeslot last week, which should be encouraging to fans.

“Spartacus: Gods of the Arena” (10 p.m., Starz). Batiatus schemes to become a major player in the local gladiator scene, and plots revenge after his beatdown last week. Over-the-top bloodshed and gratuitous sex ensue.

Record it

“Ricky Gervais Show” (9 p.m., HBO). Tonight’s topics: Karl’s take on take-out food, anatomy and films with subtitles.

Skip it

“Primetime: What Would You Do?” (9 p.m., ABC). Again? Here’s what I would do: Not watch.

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