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In a touching farewell to a beloved, killed off character, “The 100” finale evaded the end of the world … and then threatened another nuclear apocalypse.

Using Ontari’s (Rhiannon Fish) blood to keep her body from rejecting the A.I., Clarke (Eliza Taylor) inserts the flame into her own neck and enters the City of Light to stop ALIE from world domination.

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While Bellamy (Bob Morley), Octavia (Marie Avgeropoulos) and Pike (Michael Beach) struggle to keep her body safe from the encroaching chipped Grounder army, Abby (Paige Turco) and Murphy (Richard Harmon) desperately try to keep Ontari alive long enough to keep her blood pumping into Clarke.

Clarke finds help from Raven (Lindsey Morgan), who hacks into the City of Light from Arkadia, and surprisingly, Lexa (Alycia Debnam-Carey). With the flame now connected to her mind, Clarke has access to what is left of Lexa’s consciousness, who helps her evade ALIE’s evil mind slaves.

While fans of “The 100” are still torn about Lexa’s fate, this farewell definitely fulfilled the heroic sendoff most thought she would have. Saying goodbye to Lexa again was tragic, but she got one last kiss with Clarke, a touching “I love you” from the girl she cared about so much, and the warrior’s death she deserved.

Thanks to her sacrifice, Clarke manages to shut ALIE down for good, but there may be new problems on the horizon.

ALIE warns Clarke of the nuclear sites across the globe that have begun to deteriorate and leak more radiation into the atmosphere. The Sky People may be more resistant to radiation than the Grounders, but not even they can survive another nuclear apocalypse.

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If ALIE is telling the truth, “The 100” fans should be on the lookout for a few warning signs in Season 4 that ALIE foretold. Black rain, undrinkable water, and radiation lesions will signal it’s time to save the world again.

With six months left to live, should Clarke and the gang take their cue from The CW’s new show “No Tomorrow” and just live it up with the time they have left? Or will they find themselves facing yet another struggle to survive on the ground?

“The 100” will return to The CW in the Spring of 2017.