Holden tries to convince Fred Johnson to destroy the last sample of protomolecule. Naomi gets an important lead to her son. On Luna, Avasarala begins to hunt for Marco Inaros.
Holden and Fred deal with infiltrators on Tycho. Drummer's past comes back to haunt her. Amos returns to Baltimore. Alex and Bobbie's investigation on Mars leads to rogue soldiers.
Jimmy shares some of his favorite uplifting viral videos in another What Are You Doing Wednesdays, then chats with Tina Fey and Patty Jenkins before welcoming musical guest Marcus King.