A silent, but mysterious threat was encountered by the characters in "The 100" season 3 episode 6 while a time travel to a dark past is the core of episode 7.

"The 100" season 3 episode 6 is entitled "Bitter Harvest." According to Spoilers Guide, Clarke (Eliza Taylor) was torn between mercy and vengeance in the episode while Octavia (Marie Avgeropoulos) and Kane (Henry Ian Cusick) worked hand in hand to avoid a disaster. Then, Abby (Paige Turco) was still concerned about Raven (Lindsey Morgan).

According to TV Fanatic, the episode had been a slow episode, as evidenced by discussions and plans before the explosive revelation at the episode's conclusion. The episode also saw Jaha announce that the name of the 13th station was Polaris and fans saw a remnant of a space station.

Meanwhile, "The 100" season 3 episode 7 is entitled "13" and it centers on a flashback to a darker time. According to Spoilers Guide, the episode will see Lexa, played by "Fear the Walking Dead" actress Alycia Debnam-Carey as she tries to preserve peace and order with the clans. Then, Clarke (Eliza Taylor) also discovers an odd and pivotal truth.

Along with a flashback to a dark chapter of man's past, "The 100" season 3 episode 7 is directed by Dean White and written by Javier Grillo-Marrxauch.

An American post-apocalyptic drama television that premiered on The CW, "The 100" is set 97 years following a nuclear war that destroyed almost all life on Earth, with survivors living on 12 space stations on Earth's orbit. 

"The 100" season 3 episode 6 aired on Feb. 25 while episode 7 is set to air on Mar. 3.