As we head into the second half of season 4 of THE 100, the situation on the ground is only getting worse. Last week’s plan to go into space and make Nightblood so that everyone can survive the coming radiation abruptly ended when Clarke, Bellamy and King Roan lost a barrel of hydrazine on their way to Becca’s Island. Without the necessary amount of fuel to power the rocket, they’re all now permanently stuck on Earth.
So it’s time to change directions yet again, and Abby’s next plan could turn deadly. In this week’s episode, titled “Gimme Shelter,” the good doctor wants to continue running tests for a possible cure to the radiation, but she’s going to need a human test subject. Her plan requires injecting someone with Luna’s bone marrow, then exposing that person to massive amounts of radiation. If it doesn’t work though, and they won’t know until they try, that person will suffer a painful death. Clarke and Abby must make a choice on whether to go forward.
Back at Arkadia, the black rain they’ve planned for has finally arrived, and it will push everyone to their limits. Trapped together in what’s left of the Ark, families and loved ones will be separated from those left outside, including Octavia. Bellamy heads out into the storm in search of his sister. Emotions are running high, and everyone will have to face some uncomfortable truths by the end of the night.
Watch some sneak peeks from the new episode below. THE 100 airs tonight (March 22) at 9:00 p.m. ET/PT on The CW.