All of “The 100” Season 5 has been building to Tuesday’s finale episode. The ending was split into two parts, with the first half airing last week and the second airing Tuesday night.

In the final installment of the Season 5 finale of The CW series, titled “Damocles – Part Two,” Clarke (Eliza Taylor) and her friends must work together and risk everything they’ve got, not just to survive the battle, but to win the valley. It’s just as they’re in the midst of risking it all that they “glimpse an even darker threat to the last living valley on earth,” according to the episode synopsis.

In the end, who will win the fight and take the valley for themselves and their people? Possibly no one.

“If I can’t have this valley, no one can,” McCreary (William Miller) says in the episode promo.

It’ll take all that Clarke and her friends have got to stop McCreary and win it all. The end of last week’s episode put them in a better position to do so, as Clarke finally decided to let Madi (Lola Flanery) be the Commander she’s meant to be. While she was off with Echo (Tasya Teles) saving Bellamy (Bob Morley), Octavia (Marie Avgeropoulos) and their team, Clarke headed off to deal with her own mission to stop McCreary from firing his missiles.

“Into the finale, we see [Clarke] now still fighting to protect Madi, so it’s not as if she’s letting Madi go on her own,” show creator Jason Rothenberg told KSiteTV. “[Clarke] has a mission, it’s now in alignment with other heroes, who may or may not forgive her so quickly, but will all be grateful if she succeeds in her mission, which is to keep that transfer ship from flying and launching missiles at the army.”

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Lola Flanery as Madi and Marie Avgeropoulos as Octavia in the Season 5 finale of “The 100.” Diyah Pera/The CW

It’s important that Madi’s able to take on this role that she was meant for because she could be their secret weapon to taking down the enemy.

“She ascended to the Commandership and now is essentially the head of the army, which may or may not make it into the valley,” Rothenberg said. “She’s fulfilling her destiny, so to me that’s really exciting…She’ll be pivotal, she’s the Commander now. The Commander is big deal in this universe. She’s legit.”

Tuesday’s finale showdown might mark the end of Season 5, but it won’t be the end of “The 100.” The show’s already been renewed for a Season 6, and the CW boss, Mark Pedowitz, doesn’t believe that’ll be the end of the series either.

“I doubt it actually,” Pedowitz said during The CW’s Television Critics Association event when asked whether Season 6 would be the show’s last, according to TV Guide. “Jason [Rothenberg] did a remarkable job of revitalizing the show, and I hope it can go on for a long time.”

Part two of “The 100” Season 5 finale, which was directed by Dean White and written by Rothenberg, airs on Tuesday on The CW at 8 p.m. EDT.