Daniel leads Madison, Travis and Ofelia on a mission to rescue Nick and Griselda from The National Guard before COBALT goes into effect.
Meanwhile Liza and Dr. Ortiz face a harrowing situation as the base is breached by thousands of infected while Chris and Alicia face a human threat as the entire group fights to reunite and escape LA.
Both the Ark and the 100 celebrate Unity Day. The Ark is devastated by first an explosion, then an attempted coup. Meanwhile, on the ground, Clarke, Finn, and Octavia set up a meeting with the grounders.moreless
Clarke and Bellamy search for supplies as winter nears. Meanwhile, Octavia helps a friend escape.
Oliver attempts to protect his family after Slade launches the next stage of his plan for revenge for Shado's death and Oliver's betrayal. However, one of Oliver's team questions whether Oliver is seeing clearly. Meanwhile, Isabel schemes to take control of Queen Consolidated.moreless
The Huntress returns to town to kill her father, who has been arrested. Oliver promises Sara that he'll stop his ex-girlfriend. However, when Huntress takes a courthouse hostage, including Laurel, Sara steps in. Meanwhile, Roy realizes the cost he must pay to keep Thea safe.moreless
Oliver discovers that Slade is alive and intends to get revenge for Oliver's actions against him on the island. Meanwhile, in flashback Oliver and Sara prepares to take the Amazo, but Sara tells Oliver that he must kill Ivo to keep the doctor from revealing to Slade who is responsible for Shado's death.moreless
Stephen and Russell head out for a night of fun only to run into a potential new breakout. They report back to John and Cara about the discovery but want to keep a low profile from ULTRA.
Russell learns of his father's death and struggles with the decision of whether or not to return home. John volunteers to go with him to keep him out of trouble.
Meanwhile Jedikiah has a secret that could destroy his career.
Ezekiel warns the Winchesters that a group of disgruntled former angels are hunting their friend Castiel, and the brothers set out to find him before it's too late. Meanwhile, Castiel learns more about the human lifestyle.moreless
In the Enchanted Forest, Emma teams up with Captain Hook to find a magic compass that could help her and Mary Margaret return to Storybrooke. In the past, Emma is still on the streets, steals a car, and meets a lover,moreless