Season 4, Episode 6 - In the aftermath of Arkadia's destruction, tensions rise as an angry mob is out for Ilian's blood leaving Kane and Monty desperate to fend them off. As Raven uses a simulation to reach space to create the nightblood cure, complications arise as Clarke, Bellamy, and Roan try to get the last of the hydrazine to Raven as every last drop is needed for Raven to reach space.