Bellamy is able to get Clarke to agree to accompany him to the drop ship. Dr. Tsing is in charge of a deadly experiment.

Clarke wrestles with a decision. Bellamy learns that something isn't what it seems. Meanwhile, Murphy plots to betray his former Chancellor.

Clarke’s determination to protect Madi puts Bellamy in an impossible position.

A special Naming Day changes everything in Sanctum. Gabriel comes face to face with an old friend.