When the foster mother and chief of staff of Martha's, Naomi, is brutally murdered, her adopted daughter, Maddie stays with Martha and Clark. The girl becomes close to Clark and speaks for the first time in years. But when she discloses her power to shatter glass, she becomes the prime suspect for the death of Naomi and her biological mother after Lois voices her suspicions to it. While Clark investigates the origin of Maddie, her powerful father, who also has the same ability, breaks out of prison and abducts her. Meanwhile, Chloe witnesses Lex and Lana too close to each other, and later she accuses Lex of taking advantage of the vulnerable Lana.

Still gravely pondering his place in life, Clark lets Lois drag him along to their Smallvillle high school reunion. Rather than enjoying his hero status, while Lois shines less than she expected, Clark worries when he spots Brainiac, but it turns out he returned from the future with the Legions ring to show Clark how vital his contribution is to prevent a horrible future for him, Oliver, their friends and the world.

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 is surprised to see Martha on the news speaking at a pro-vigilante rally. However, surprise quickly turns to horror when he and Lois watch as Martha is injured in an attack on national television. Meanwhile, Lionel reveals himself to the world and reclaims LuthorCorp from Tess and Oliver. Lois and Chloe decide to cheer Clark up by showing him videos from thousands of vigilante supporters professing their support for The Blur.