Season 3 starts tonight, with Jack (Matthew Fox), Kate (Evangeline Lilly) and Sawyer (Josh Holloway) held captive by The Others. That opens the show up to a new host of plot directions.

Creators of the show have said we'll learn more about The Others this season, and teasers hint at a major revelation about Desmond's wealthy lover and the trackers who alerted her to the electromagnetic waves that resulted from the destruction of the hatch.

This season will explore why Jack, Kate and Sawyer were targeted, and whether Sun's baby is really Jin's. And a new woman (one of The Others?) catches Jack's attention.

With a little digging, we turned up clues to the gripping ABC drama.

WHO IS SUN'S BABY-DADDY?

Pre-crash, a doctor said Sun's husband, Jin (Daniel Dae Kim, right), was infertile. There are three possible explanations for Sun's pregnancy: The island healed Jin's infertility (worked for Locke, leg-wise); the zygote formed inside Sun (Yunjin Kim, left) but is neither hers nor Jin's (creepy!); or Jin is not the baby-daddy. That guy could be Jae Lee, who gave Sun secret English lessons. She was unhappy in her marriage, and planned to leave Jin and go to America..

WHO ARE THE OTHERS?

They're creepy, wear fake beards and have captured Kate, Jack and Sawyer.

Are they "the good guys," or are they up to no good? Finally — finally! — that enigma will be addressed this season, producers have teased. They better deliver. Also, expect to see much more of bug-eyed Other/hatch escapee Henry Gale, played by new series regular Michael Emerson.

WHAT HAPPENED AT THE HATCH?

In the Season 2 finale, Locke, Mr. Eko (Adewale Akinnuoye-Agbaje, right) and Desmond (Henry Ian Cusick) were all in the hatch when Desmond turned the fail-safe key to diffuse whatever electromagnetic energy was quaking the island (yes, that button-pushing chore actually meant something). An explosion ensued. The hatch door landed on the beach. Survival seems like a long shot — but Eko and Locke are under contract. And Cusick is now a series regular. They gotta come out of this alive, if not somewhat — somehow — changed. Plus, ABC says Locke will team up with Sayid (Naveen Andrews) and others to try to rescue Jack, Kate and Sawyer.

WHO WILL KATE FALL FOR?

It's about time, Kate. The freckled tough girl will finally make a choice between doctor-leader Jack, left, and con man Sawyer, above. Early intel suggests Cupid's arrow is pointing at a Kate-Sawyer hookup — they ARE a couple of good-lookin' outlaws. And Jack? According to an ABC press release, "Romance looms on the horizon as Jack's interests veer toward a mysterious woman whose motives may be questionable."

IS CLAIRE JACK'S HALF-SISTER?

That's the buzz — and it appears to be so. After losing his medical license for operating while drunk, Christian (Jack's father) fled to Australia, where he drank himself to death after trying to visit his secret daughter. It went down like this: He showed up at the house of a curly-haired, blonde Aussie and demanded to see the girl. The woman refused. Jack arrived Down Under to bring Christian's body back to the U.S. and wound up on the ill-fated flight with Claire, right.

WHY WAS LOCKE IN A WHEELCHAIR?

John Locke (Terry O'Quinn, right) lost of a bit of his faith last season, thanks to his frustration with entering that numbered sequence (4, 8, 15, 16, 23, 42) on the keyboard every 108 minutes. Still, he can't deny the island's mysterious healing powers, which apparently cured his four-year paralysis and allowed him to walk again after Oceanic flight 815 crash-landed. Those powers — and why exactly Locke was bound to a wheelchair in the first place — will be explored this season, "Lost" experts say. One theory: Locke, who helped his deadbeat father withdraw stolen money from a bank, was handicapped by angry victims of the crime.

WHAT IS DHARMA DOING WITH THE KIDS?

The Others snatched Walt, Frenchwoman Rousseau's daughter, Alex, and a very pregnant Claire (Emilie de Ravin). In memories of her abduction, Claire was taken to a hospital-like hatch and given a shot in the belly. A teen girl, who might be a grown-up Alex, warned her that higher-ups planned to kill her and take her baby. That's pretty freaky, and so is another theory: That The Others — those "good guys," remember? — are a social utopian experiment by the scientist-led Dharma Initiative. This could explain why they steal innocent children who haven't been tainted by society.

WHO IS LIBBY?

Michael shot and killed her last season, but viewers haven't seen the last of Libby (Cynthia Watros, left). She'll keep appearing in characters' flashbacks, producers said, yet her back story — she claimed to be a clinical psychologist and was supposedly among the plane's tail-section survivors — is shrouded in mystery. In flashbacks, it was revealed that she lived in the same mental hospital as an unknowing Hurley (Jorge Garcia) and gave Desmond her late husband's doomed sailboat. Fan speculation has it that she might be a member of the Hanso Foundation, which funded the shady Dharma Initiative, or a private detective.

DID MICHAEL AND WALT ESCAPE?

The father-son duo, given a motor boat by Henry Gale, were last seen fleeing the island to destinations unknown. Desperate dad Michael (Harold Perrineau, right) betrayed his friends to save himself and his son, Walt (Malcolm David Kelley, left), who was kidnapped at the end of the first season by The Others. But don't be surprised if they return — those "Lost"-ies aren't the luckiest group. Note that Perrineau is not a regular cast member this season but could be back as a guest star. And Walt is way too intriguing to make a permanent getaway.

CAN THE SHOW KEEP IT UP?

As many fans complain, "Lost" is more about questions than answers. It's confusing and captivating. The dark and hatch-centric second season was filled with sci-fi mysteries. The Powers That Be heard fan feedback — a producer revealed he was influenced by complaints that Season 2 was "too mythologically dense." Expect to see a lot about relationships in future episodes, including a dose of much-needed romance.