Roan brought what appears to be the entire army of Azgeda with him to confront Clarke and the Sky People.

There's tension between Clarke and her people at Arkadia, after the uncovering of her list of the 100 who would be allowed to live in Alpha Station.

Raven convinced Luna that humanity is worth saving. But the question is, how far is Raven willing to go – and how many lines is she willing to cross – to save her people?

Luckily for Abby, she has her right-hand man Jackson there with her to help turn Luna's blood into a viable solution to save everyone.