Season 2 - Episode 18
Lena's ex, Jack Spheer, arrives in National City to roll out a new nanite medical procedure. However, Kara soon realizes that something more is going on when one of the human test subjects die under mysterious circumstances. Meanwhile, Lyra comes between Winn and James in their crimefighting efforts.
|Aired On:||Monday 24th of April 2017 on The CW ( US )|