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It's time to welcome fall's slate of new and returning shows and say goodbye to summer's light sci-fi fare. I'm looking forward to catching the final episode of Eureka's third season this week, as well as the second season premiere of Fringe. We've also got new episodes of Supernatural and The Vampire Diaries headed our way, plus Saul Tigh guest stars on Warehouse 13. Read on for this week's TV picks and video previews.

- Warehouse 13, "Nevermore" – Myka's hard-ass dad, played by Battlestar Galactica's Michael Hogan, falls under an Edgar Allan Poe-related artifact's spell. Pete and Myka travel back to Myka's home to try and save daddy before its too late. This episode promises to be a big deal for Myka, who we know has a very rocky relationship with her father. Hopefully, this ep will leave room for Hogan to return in a recurring role. (Tuesday, 9 p.m. on Syfy.)

More picks and previews after the jump.

We've only got a few more weeks until some of our favorite summer series go into hibernation to make room for fall's slate of new shows, including Stargate Universe, V, Flash Forward and Human Target. We'll be covering those shows and more here on TV Geek Week this fall. We'll also be geeking out over returning shows like Dollhouse, Fringe and Lost. But summer isn't over yet, so check out this week's picks below.

True Blood, "Beyond Here Lies Nothin" - OK, I'll be honest here. We really don't know any more about Sunday's True Blood season finale than we did last week, but we still can't wait to watch. The HBO series has really kicked it up to eleven this season with great drama, horror, humor and mystery. Lots and lots of mystery. Will we find out more about Sookie's supernatural side? Will Jason and Andy help save the day? Will Erik steal Bill's hero moment and make Sookie's steamy V-induced dreams come true? And will someone finally please kill Maryann? I love Michelle Forbes, but isn't it time for her to start filming a guest spot on Stargate Universe or something? Check out the trailer after the jump and this gallery of pics from the season finale. (Sunday, 9 p.m. on HBO.)

More TV picks and previews after the jump.

You'll have to wait two more weeks to watch the sure-to-be freaky season finale of HBO's True Blood. Last Sunday's ep, "Frenzy," was one of the series' best yet. We were introduced to Sophie-Anne, the strange, hilarious and decadent Vampire Queen of Louisiana. But everything went to hell in Bon Temps while the Queen kept Bill waiting in her "day room." Lots of new questions were brought up (what's the deal with the egg?), and now it looks like Sookie Stackhouse's darkest night is about to fall.

On the lighter side, Syfy is treating us to a 24-hour Eureka marathon on Friday, and the always-awesome Joe Morton visits Warehouse 13 on Tuesday.

Head after the jump for more TV picks and previews.

This week, two of our favorite Eureka residents, Erica Cerra and Niall Matter, visit Warehouse 13 to complicate Pete and Myka's Vegas vacation. And Evan Rachel Wood's Vampire Queen makes her bow -- and gives Bill hell -- in the next awesome and absurd episode of True Blood.

Warehouse 13, "Duped" - The show finally (sort of) broke away from the stale artifact-of-the-week formula last Tuesday by offering a glimpse of Artie's dark past. Things are bound to get weird this week when Myka steps through Lewis Carroll's magical looking glass and is replaced by her slutty, Tesla trigger-happy clone. In case you haven't heard, Eureka's Niall Matter and Erica Cerra are guest starring. I'll let them explain their roles to you in the second video posted below. (Tuesday, 9 p.m. ET on Syfy.)

Head after the jump for more TV picks and previews.

With the fall TV season approaching, it's almost time to say goodbye to some of our favorite (and least favorite) summer sci-fi shows. There are only four more episodes of Eureka's third season left, and the first season of Warehouse 13 will be over in less than six weeks. Defying Gravity will wrap its first season in less than a month (if ABC doesn't cancel it due to low ratings first), and Being Human only has two more episodes scheduled to air on BBC America. Over on HBO, True Blood is sprinting to the finish of season two with only three episodes left, but the cable network has already given the green light to season four.

The fall will bring some slightly darker sci-fi fare with the premiere of ABC's Flash Forward in September, the mid-season launch of the V redo, and the premiere of the final season of Lost in 2010. Dollhouse and Fringe will return to Fox for their second seasons in September, and the network will launch the comic book adaptation Human Target in 2010. Syfy's new season starts in October with the two-hour premiere of Stargate Universe. Look for Caprica, the Battlestar Galactica prequel series, to hit the air January 22 on Syfy. Oh, I almost forgot ... Heroes comes back to NBC on Sept. 21.

We'll have more about these new and returning fall shows starting next week. Now lets get to this week's picks and previews.

The soapy Defying Gravity sinks, Warehouse 13 gets a boost from a spunky new cast member, and a spaceship touches down on Eureka in this week's dose of sci-fi TV. Click through for more picks and preview videos.

Warehouse 13, "Burnout" - I still have problems with the show's formulaic structure and its dull mystery plots, but thankfully Allison Scagliotti-Smith is shaking things up a bit as newbie whiz kid Claudia. With "Burnout," Pete and Myka dig little deeper into the history of the Warehouse and find that a former agent didn't get the chance to finish his assignment. (Tuesday, 9 p.m. on SyFy.)

This week, Ron Livingston gets lost in space as Defying Gravity returns to Sunday night, and a Stargate Atlantis alum visits Warehouse 13 (no it's not Rodney McKay!). Read on for this week's sci-fi TV picks.

Defying Gravity, "Threshold" - ABC's new space drama is no Virtuality – there's little darkness or hard sci-fi elements, and the vibe is anything but existential – but it's not exactly Grey's Anatomy in space either. The first hour of last night's premiere was a well-constructed look at a team of young astronauts facing the biggest journey of their lives. Still, there wasn't much for sci-fi fans to get excited about except for Ron Livingston's (Office Space) likeable performance as a down-and-out spaceman (his hammy voiceover works surprisingly well) and some decent-looking outer space FX shots.

The series' main focus is on the various romantic entanglements of the crew of the spaceship Antares. Unfortunately, the characters seem more concerned with their sexual relationships than exploring the cosmos. Some clumsy storytelling and a few questionable casting choices (is it too late to re-cast Ellen Pompeo clone Laura Harris as the female lead?) might sink this one before it gets a chance to soar. So why am I still watching? The creepy mystery plot has me hooked.

The show's sci-fi elements come front-and-center this week as the Antares' crew suffers cellular and psychological transformations courtesy of the mysterious force manipulating their mission. (Sunday, 10 p.m. ET on ABC.)

Click through for more TV picks and preview videos.

Now that everyone is back from Comic-Con, it's time for me to finally go on summer vacation.

I'm heading out to the Grand Canyon for the first time and, hopefully, I'll be chowing down on a Vulcan Burger at the Red Planet Diner in Sedona, AZ sometime soon. I'm writing this abridged version of TV Geek Week from the road, so click through for this week's sci-fi TV picks.

Welcome to TV Geek Week -- a new weekly column about sci-fi TV news and programming.

Screw Harry Potter. For me, the U.S. premiere of Torchwood: Children of Earth is the biggest and most anticipated geek event of the month. After a record-breaking run in the U.K., the five-part miniseries lands stateside tonight with an absorbing first hour on BBC America.

With its first two seasons, The Doctor Who spin-off offered a mature and sexy but undeniably quirky look at a team of Cardiff-based investigators fighting alien threats. Judging by the raves from the British press, and the promising first hour, Children of Earth takes things to a higher level with an epic scope, a bigger budget, and more twists and turns than the series' first two seasons combined.

Tonight's ep sees the Torchwood team responding to an alien invader that announces itself by possessing the world's children and making them chant a creepy warning, "We are coming." It's even more unsettling than it sounds, and it sets our heroes – the debonair Captain Jack Harkness (John Barrowman), reliable Ianto (Gareth David-Lloyd), and the fetching Gwen (Eve Myles) – off on a dangerous adventure involving cagey new characters, government conspiracies and, er, blood-spewing monsters.

If it sounds like Torchwood is full of cheap thrills, well, that's because it is. But the series handles all the B-movie business with wit, charm and heart – three things sorely lacking from some of this summer's big screen blockbusters. (Tonight through Friday, 9 p.m. ET on BBC America.)

Check out more TV picks and the first seven minutes of Children of Earth after the jump.

Welcome to TV Geek Week -- a new weekly column about sci-fi TV news and programming. Don't forget to click through for this week's TV picks.

Not everyone loved last week's premiere of Warehouse 13, Syfy's fun and quirky new show about a pair of government-sponsored paranormal investigators. I certainly wasn't crazy about the two-hour premiere, but I'm still looking forward to catching episode two, "Resonance," airing Tuesday night. Something tells me the show's goofy tone and old school mystery plots will go down easier in an hour-long format.

Tuesday's episode will feature an appearance by one of Battlestar Galactica's steamiest Cylons, Tricia Helfer. Her appearance is the first of a promised lineup of geek-friendly guest stars for Warehouse 13. According to Syfy, BSG alums Michael Hogan and Mark Shepard and Stargate Atlantis good guy Joe Flanigan are slated to appear in the first season. The show will also welcome a new recurring cast member early in season one. 19-year old actor Allison Scagliotti will eventually show up as a computer hacker who might be able to teach Artie a thing or two.

Check out more of this week's TV picks plus a Warehouse 13 video preview and another pic from the ep featuring Helfer after the jump.