The fourth season of "The 100" starts in a slow fashion, giving closure to a couple of story-lines while introducing some of the ideas that will dominate throughout the remainder of the season.
We left our heroes with something of a conundrum: the City of Light was finished, but the aftermath of it was not. Roan is more dead than alive, Clarke and Bellamy have to decide what to do with the information they got from the A.I., the Skaikru have not many friends left on the ground...
The episode does a good job in bringing the viewer back to the story. All the characters we have get to know and care for get some screen time, and even get some character development (Jasper, for example) that you many not expect in an introduction to a new season. All the moody atmosphere and sense of desperation is back, and the violence and fear too. On the other hand, the episode suffers a little bit in its pace, the first minutes a little bit slow as it tries to help the viewer remember how we got there.
With a new threat, one that seems insurmountable, "The 100" has all the tools it needs for some very exciting new episodes.