Daenerys receives an unexpected visitor. Jon faces a revolt. Tyrion plans the conquest of Westeros.
The downworlders retaliate after Valentine’s attacks. The New York institute deals with the repercussions Valentine caused. New faces immerge from the shadows to help the Shadowhunters.
Cosima is forced into an alliance with Susan Duncan when an old enemy returns to the Island. Meanwhile, on the mainland, Krystal stumbles onto a vital clue to the Neolution endgame.
While Sarah and Kira spend time at home bonding, Cosima unlocks the island’s biggest secret, discovering a link between the village’s so-called creature and the science around Kira.
Jon organizes the defense of the North. Cersei tries to even the odds. Daenerys comes home.
Supergirl challenges Rhea to battle to save National City. Meanwhile, Superman returns and Cat Grant offers Supergirl some sage advice.
Supergirl struggles to decide whether or not to obey the President’s orders regarding Rhea’s latest actions. Meanwhile, Cat Grant returns to National City.
National City is attacked by a Phorian, a normally peaceful race with telekinetic abilities.
When Alex is kidnapped, Supergirl and Maggie must work together to save her.
Lena’s ex-boyfriend Jack Spheer comes to National City to reveal his breakthrough in nanotechnology that has the potential to eliminate all diseases.
Oliver assembles a group of unlikely allies – Slade, Nyssa, Merlyn and Digger Harkness – to engage in an epic battle against Chase and his army
Black Siren returns to give Chase help; Felicity plans a birthday party for Oliver; Lance is angry with Rene for missing the custody hearing about his daughter.