<Tr> <Td_colspan="8"> Two days after the massacre, Raven discovers that Mount Weather has jammed communications . Leaving camp to investigate, Bellamy and Octavia discover that Lincoln has become a reaper . Clarke still hasn't spoken to Finn . Raven manages to listen in on Mount Weather's radio broadcasts and discovers the previously encountered acid fog is a weapon of the mountain . In Mount Weather, Wallace wants Jasper to find volunteers to provide blood for the mountain residents, but he is unsuccessful . Maya discovers the radiation leak she was caught in was no accident and confides in Jasper about the mountain's caged grounders . In captivity, Jaha and Kane are told that one of them must kill the other to gain an audience with the Commander . Kane attempts to take his own life rather than kill Jaha, but a grounder witness, Lexa, reveals herself to be the Commander and says that she believes their wish for peace is sincere . She sends Jaha to Camp Jaha with a message; leave within two days, or die . </Td> </Tr> <Tr> <Th> 20 </Th> <Td> 7 </Td> <Td> "Long Into an Abyss" </Td> <Td> Antonio Negret </Td> <Td> James Thorpe </Td> <Td> December 10, 2014 (2014 - 12 - 10) </Td> <Td> 3J5257 </Td> <Td> 1.62 </Td> </Tr> <Tr> <Td_colspan="8"> With the grounders' deadline imminent, Abby and Jaha disagree over what the survivors are to do; Jaha wishes to evacuate to the so called "City of Light", while Abby wants to remain behind to rescue the 47 . Clarke, Octavia, and Bellamy hold the reaper - state Lincoln in the dropship, and learn he was drugged and experimented on . Lincoln's heart stops but is restarted by Clarke, who believes there is a way to cure reapers--information they can leverage to the grounders . When Abby is successful in curing Lincoln, Lexa grants Clarke the truce but demands Finn's execution for the massacre before it can begin . In Mount Weather, Jasper, Monty, Miller, and Harper discover that there are Ark survivors on the ground . Dr. Tsing learns that for the mountain residents to live on the surface, they would have to kill the 47 for their bone marrow . Though Wallace vetoes the plan, his son Cage goes behind his back and begins the process with Harper . </Td> </Tr> <Tr> <Th> 21 </Th> <Td> 8 </Td> <Td> "Spacewalker" </Td> <Td> John F. Showalter </Td> <Td> Bruce Miller </Td> <Td> December 17, 2014 (2014 - 12 - 17) </Td> <Td> 3J5258 </Td> <Td> 1.40 </Td> </Tr>

When does the next episode of the 100 come out