This guide covers " Praimfaya ," the Season 4 finale (Episode 13) of the post-apocalyptic series . The Episode Context
When the rocket’s communication system fails, Clarke must manually align a satellite dish at a nearby tower to power up the Ark’s life support.
After a tense sequence where they nearly run out of oxygen, the "Spacekru" successfully docks and activates the Ark's ventilation systems. The 6-Year Time Jump
The episode ends with a massive leap forward of : The 100 finale recap: Season 4, episode 13
Unable to reach the rocket before launch, Clarke is left behind on the ground as the firestorm hits.