The series, developed by Jason Rothenberg, is loosely based on a 2013 book of the same name, the first in a series by Kass Morgan.
The series follows a group of teens: Clarke Griffin (Eliza Taylor), Bellamy Blake (Bob Morley), Octavia Blake (Marie Avgeropoulos), Jasper Jordan (Devon Bostick), Monty Green (Christopher Larkin), Raven Reyes (Lindsey Morgan), Finn Collins (Thomas McDonell), John Murphy (Richard Harmon), and Wells Jaha (Eli Goree) as they become the first people from a space habitat to return to Earth after a devastating nuclear apocalypse.
The series also focuses on Dr. Abby Griffin (Paige Turco), Clarke's mother, Marcus Kane (Henry Ian Cusick), a council member on "The Ark", and Thelonious Jaha (Isaiah Washington), the Chancellor/Wells' father.
The 100 Season 1 Ringtone
The 100 Seasons 2 and 3 Ringtone