Hope and reality were the themes of the two-part "The 100" season 3 season finale. Also, Alie told Clarke a very uncomfortable bedtime story in the finale, which saw whether the latter would press the kill switch.

The season finale for "The 100" season 3 was divided into two episodes. First episode 15, entitled "Perverse Instantiation - Part One." According to Spoilers Guide, Clarke found hope in the most unlikely place. In addition, the episode saw the actualization of Alie's master plan and its overall impact to them and to others.

"The 100" season 3 episode 16 is entitled "Perverse Instantiation - Part Two." The episode featured a final showdown among characters, as the heroes started to see the truth of their tragic scenario. The episode also served as the season's notable and mind-bending conclusion.

According to TV Line, the season 3 finale of "The 100" also saw Alie try to keep Clarke from hitting the kill switch and this was done through telling the world's most uncomfortable bedtime story. Clarke seemed unaware of the potential consequences that might happen if he pressed the switch.

The story mentioned that there were a dozen nuclear facilities waiting to blow, should the kill switch be engaged. It was added that 96 percent of the earth surface would be uninhabitable in less than six months, which also affected those born outside the planet. To conclude, the season finale saw Clarke hit the switch.

"The 100" season 3 episode 15, "Perverse Instantiation - Part One," aired on May 12, while episode 16, "Perverse Instantiation - Part Two," aired on May 19.