Raven has the technical know-how to get the rocket ready for launch, but it remains to be seen whether she'll be able to do so in time to clear the death wave.

Clarke and Bellamy had a disagreement over opening the bunker door but seemed to resolve it before arriving at Becca's lab. Unfortunately for fans who were hoping for a romance between the two this season, it appears that time's just about up on that front.

Before the group can head to space, there's a lot of work to be done to prep the rocket to make the journey.

Luckily, Octavia has Indra by her side, as her second, to help her rule.

Since winning the conclave, Octavia has been the de factor leader of grounders and Sky People alike. But how will she fare without her brother for at least five years?

The heroes must make some impossible decisions on the season finale of The 100. "Praimfaya" is the 13th episode of the show's fourth season.