Roan gets his army on the road, ready to take Arkadia. Clarke will try to convince him of the need to unite to survive. Raven and Abigail continue their research. And... will Octavia survive?
The episode centers on the oncoming clash between Roan and his people and Arkadia's population and it delivers a gripping and full of strength episode, with a great pace, amazing atmosphere, good acting all around, and a couple of plot twists that will keep the viewers gripped to their seats, so worried will they be with what may or may not happen. The episode does a great job in explaining why it is better to collaborate than compete, but the difficulties behind people joining forces for a better outcome for everyone.
"The Tinder Box" is still, though, a little bit all over the place. "The 100" is starting to show signs of the need to create the path for a clear and satisfying ending. And Raven's story-line is a little bit silly (even if the plot more or less explains why and how happens what happens).
However, these are minor problems. The best episode of the season.