The 100's Bellamy is in for one brutal Mount Weather experience.

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Lincoln managed to get Bellamy into the lair of the Mountain Men, but it will be up to the teen to survive the horrors that President Wallace has in store for his Grounder lab rats.

"Bellamy is now the inside man, he is the whole mission," executive producer Jason Rothenberg teased in a preview for "Coup de Grace." "Everything is riding on him getting into Mount Weather, and now we'll get to see what happens on the other side of that door to a Grounder as they're brought in for processing and into the Harvest chamber...and it's awful. But he's inside."

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While Octavia anxiously hovers over the radio in hopes of a message from his brother, Clarke and Co. will have their own problems to deal with. An assassination attempt on the alleged leader of the Sky People will provide the new alliance with a captive Mountain Man to question.

Will either of the series' prisoners be able to help in the battle against Mount Weather? Find out when The 100 airs Wednesdays at 9 p.m. ET on The CW. Click the video below to see a preview for the series' next episode.