The 100 sees its series premiere on March 19, and The CW has now released an official description for the show's second episode, which we can find on March 26.
The title of the episode is "Earth Skills" and it introduces Lindsey Morgan as "Raven" - a character who is bound to be a fan favorite. (Note, that's Marie Avgeropoulos in the picture to your right, not Lindsey Morgan.) Be warned, a major spoiler for the pilot is talked about in this description.
LINDSEY MORGAN (“GENERAL HOSPITAL”) GUEST STARS IN THIS EPISODE — Having discovered that Jasper (Devon Bostick) may still be alive, Clarke (Eliza Taylor), Bellamy (Bob Morley), Octavia (Marie Avgeropoulos), Finn (Thomas McDonell) and Monty (Chris Larkin) set out on a mission to locate their friend and are shocked at what they find. Meanwhile, on the Ark, Abby (Paige Turco) is determined to get to Earth, and enlists Raven (guest star Lindsey Morgan) to craft an escape pod. Isaiah Washington and Henry Ian Cusick also star. Dean White directed the episode written by Jason Rothenberg (#102).