<P> The 100 (pronounced The Hundred) is an American post-apocalyptic science fiction drama television series developed by Jason Rothenberg, which premiered on March 19, 2014, on The CW . It is loosely based on a 2013 book of the same name, the first in a book series by Kass Morgan . The series follows a group of teens as they become the first people from a space habitat to return to Earth after a devastating nuclear apocalypse . </P> <P> In March 2016, the series was renewed for a fourth season of 13 episodes, which premiered on February 1, 2017 . In March 2017, the series was renewed for a fifth season . As of May 24, 2017, 58 episodes of The 100 have aired, concluding the fourth season . </P>

When did the first episode of the 100 air