An undercover assignment reveals a deadly foe that promises to change the Kent family forever; John Henry is haunted by his doppelgänger's past; Sarah explores what the future holds for her and Jordan; Gen. Samuel Lane reclaims his post.

Lois interrupts an intense conversation between Clark and John Henry. Meanwhile, Kyle tries to run interference between Sarah and Lana. Lastly, Jonathan has a heated discussion with Candice's dad.

In the wake of learning that Bruno and Peia are married, Clark works to reignite Lois' interest in taking Bruno down. Elsewhere, Natalie meets Matteo's parents for the first time, with disastrous consequences. Meanwhile, the Kent boys clash when Jordan interferes with Jonathan's training at the Firehouse, Lana bonds with General Lane over their shared fear of dating again, and Sarah realizes her mom needs a friend.