“The 100” faces its toughest post-apocalyptic challenge yet – the end of the world, again – and the people trying to figure out a solution just keep getting more bad news.

In this exclusive clip (above) from Wednesday’s episode, Raven (Lindsey Morgan) has something to tell Clarke (Eliza Taylor) and Bellamy (Bob Morley): Turns out, ALIE’s timeline of six months until they’re all annihilated by nuclear radiation was incorrect. They have probably two months, tops.

They can triple man hours and make that accelerated deadline, but that doesn’t solve their other problem: Not everyone is going to be able to have a spot inside the sealed habitat they’re building.

Also Read: 'The 100' Season 4 Premiere Recap: The End of the World Is Coming

Clarke has been tasked with making the list of who gets entry, and Raven tries to convince her friend to start working on the list by dropping a hard truth: “Choosing who gets to live or die is your specialty.” Ouch.

“The 100” airs Wednesdays at 9 p.m. ET on The CW.

'The 100' Season 4 Trailer: 10 Things We Learned (Photos)

The CW just dropped the first trailer for "The 100" Season 4. Here's a few things we noticed.
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The apocalypse is nigh... again
The world ended before "The 100's" series premiere, but instead of slowly rebuilding a society, Season 4 appears to present another world-is-ending dilemma for the delinquents, who were born in space after the world ended the first time.
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Welcome to Azgeda?
Bellamy, Harper, Miller and Monty are seen approaching a brand new set, a massive structure at the base of an icy mountain, presumably Roan's land.
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Clarke goes solo again
As has become tradition on "The 100," it looks like at some point Clarke will be striking out on her own, this time to meet an army of Ice Nation soldiers on horseback. What could go wrong?
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New locations
For the first time on the show, we see what appears to be a map of Grounder territory. Polis, it turns out, is just one small dot on a whole system of roads and destinations. Where will the delinquents go next?
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New faces
The trailer gives us a brief glimpse of Chai Romruen's new character Ilan. We don't know much about him, but like everyone else, he'll clearly be going through some pain.
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Octavia's out for blood
Octavia is still clearly hung up on getting revenge for Lincoln's death, even after she killed Pike. The question is, who is she extracting vengeance from?
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Familiar faces
Indra is back, Echo is back -- and ready to go cause more trouble whispering into Roan's ear; Luna is back, with some unfortunate boils; and Niylah is back, hanging out with Octavia.
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Who is this?
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There's still time for romance
A few "The 100" established couples, including Monty/Harper, Murphy/Emori and especially Kane/Abby, get some nice downtime moments. Meanwhile, Bellamy and Clarke continue to do some platonic hand-holding.
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Jaha has a new hairdo
Just Jaha being Jaha.
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