Oliver returns and enlists Chloe in his vendetta against Lex, but a sexy new 'superhero' stands between Oliver and his mission, even if Lex is, ultimately, one of the bad guys.

It's been four weeks since the Fortress collapsed and Clark disappeared. Green Arrow calls upon Black Canary and Aquaman to locate the missing Clark Kent. Clark, in the meantime, is powerless and residing in a Russian prison camp in Siberia. With Lex Luthor missing and presumed dead, a new ruthless CEO, named Tess Mercer, is appointed the head of LuthorCorp and moves into Lex's mansion with her own dark plans for Clark and Metropolis. Chloe is kidnapped by a clandestine group that has discovered her special powers and they want to test the limits of those new powers by locating Green Arrow and his friends.

Clark tells Oliver that he must kill Davis, but Clark deals with the fact that he can't take a human life. This leaves the justice league to take the affair on their own hands. Then, Rokk Krinn teleports from the 31st Century to give Clark another Legion time-traveling ring so Clark can exile Davis/Doomsday to the future. But in a surprising twist, Lois confronts Tess about her nefarious plans involving a mysterious crystal and in the fight, Lois accidentally finds Rokk's ring, and gets zapped into the future. Meanwhile, Chloe gets in the middle of Clark and Oliver's fight about Doomsday's human carnage, in which Dianah/Black Cannary and Bart/Impulse intervene. Jimmy finds out Clark's identity, leading to a fateful showdown when Clark attempts to use black kryptonite to split Davis from Doomsday and seal the beast in a large hole in the ground. But nobody is prepared for what Davis will do afterwords.

Zod unleashes his army upon the world, forcing Chloe to call in reinforcements from old friends. Zod tells Lois he is The Blur and asks her to steal the Book of Rao from Clark. Torn between Clark and The Blur, Lois asks Clark to come clean with her about everything but he refuses. Chloe and Oliver attempt to reconnect Watchtower's satellite system in order to fight the Kandorians but to Chloe's horror, Oliver gets caught on site and disappears. Tess attempts to stop Zod but he leaves her clinging to life. Clark and Zod battle for control of Earth.

As the VRA threat intensifies, Clark takes initiative by closing down watchtower and declaring the League go officially underground, but will this be enough to stop Lt.Trotter and Slade Wilson aka Deathstroke from exposing them? Tensions rise in this mid-season finale.

Clark, Oliver, Lois and Dinah are back home after long VRA captivity, with confused memories and robbed of all superhero-powers. They believe they have been tortured in an experimental lab by none other than Chloe, hence fear she switched sides. Then she, or rather her avatar, appears in dreams to each of them, claiming they only lost their powers in a virtual illusion, which can nevertheless kill them for real. She calls upon them to trust her, break the virtual spell by believing it fake and thus escape back into reality, with Rick Flag's team. Oliver does so quickly, and is reunited with his true love. Clark wants to, but finds it extremely hard, until Lois joins in.