Login to unlock this video.
If you don't already have an account, sign up to enjoy more TVNZ content anytime, anywhere.
PG Octavia fights in the final battle for her people's survival, but not everyone is willing to play fair.
Earth is the greatest enemy, so how will Clarke and the others survive?
Titles, characters and all other elements are the trade marks and copyright of TVNZ or its licensors. All rights reserved. Further details available here.