We've seen the first two hours of Lost, and it'll be worth the wait.

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Dec 14, 2012, 3:54 PM EST

Ready to get Lost again? I've been back to the island, and I have to say it looks like things may be picking up as the ABC show careers toward its certain end in 2010.

I screened the first two hours of Lost's upcoming fifth season on ABC, and while I can't give you a full review at this point, I can offer a few hints about what to expect. The two parts, episodes 501 and 502, are entitled "Because You Left" and "The Lie."

Here's how ABC describes the first part: The remaining island survivors start to feel the effects of the aftermath of moving the island, and Jack (Matthew Fox) and Ben (Michael Emerson) begin their quest to reunite the Oceanic Six in order to return to the island with Locke's body in an attempt to save their former fellow castaways.

"Because You Left" picks up the story where it left off last season and begins to answer questions about what took place and why things happened the way they happened.

Unlike many episodes recently, the episode has a strong narrative with a definite point. It deftly touches base with each of the main characters, brings us up to date and begins to offer some of the answers we've been clamoring for while raising new questions and posing new dilemmas for the main characters. Without giving anything away, the show once and for all steps into the realm of science fiction with firm footing.

The episode also begins to put things we've seen before into context. The episode also sets up what appears to be the main story arc of the season: to get the Oceanic Six back to the island. To say more would be to reveal too much.

"The Lie" is partly a Hurley (Jorge Garcia)-centric story that features the momentary return of an unexpected character from the past. Lost returns Jan. 21 at 9 p.m. PT/ET.