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Eve's attempts to help her sister KT pass for human are derailed by Katherine.

Rebecca and Nick take Will to Calimov to run tests on him.

Cain and Michael Hoffman go to the Clarke house. Will Eve be able to evade discovery?

Will struggles to control his nanobots and his feelings for Lily.

Having been possessed by Mary, Eve is on high alert. Meanwhile, Abe has to deal with the arrival of his grandma.

The discovery that Mary has cheated death throws the gang into chaos. If Mary were to take control of Eve permanently, she would be unstoppable. Sending KT as bait, Mary lures Eve to a secret bunker beneath Calimov. Will and Lily are horrified to discover that Mary has built herself a body out of the reclaimed childbots. Mary wants Will to bring her inanimate body to life! The ultimatum for Will: do as Mary demands or risk Mary deleting Eve and KT's memories. Unable to bear the thought of losing his friend, Will ignores Lily's pleas and uses his nanobots to force Mary's disembodied consciousness into her robot body.

Will and Lily aren't speaking. Worse still, Will is suffering adverse side-effects from protecting his friends from the rogue KT. Nick, fearing that he might not find a way to repair Will's nanobots, puts Eve on the spot, asking her if she can find Mary. Knowing the danger Mary poses, Eve lies - and tracks her mother down in secret. Meanwhile, cajoled by Abe, Lily finally softens and visits Will just as he takes a turn for the worse.

The Clarke household is in crisis. Will's nanobots are rapidly failing, and Nick is at a loss. Determined to save his son, Nick lays aside his initial suspicions when Katherine appears with a hi-tech solution. Will comes round and, despite a nano-hangover, seems well. But, as Nick knows, he is not out of danger yet - Katherine has supplied only a temporary fix. Heeding Nick's warning, Eve tracks down Peterson with Abe in tow.

The world is changing. As Eve tries to prevent a war between humans and robots, Will struggles to control his nanobots and his feelings for Lily, and Mary plots revenge from beyond the grave...