Matthew Harrison

Kiera and an emotionally unravelling Carlos must stop Liber8 from committing a devastating chemical attack on the city. Meanwhile, Kiera finally decides one Alec has to go, and she delivers Scar Alec to the Freelancers.

To regain key incriminating information about his father's past that he lost when his memory was erased, Lex joins an experimental program headed by Dr. Garner (recurring guest star Martin Cummins). Knowing that Lex will also remember the secret of Clark's powers if he regains his memory, Clark tries to stop him--but Lionel and Garner capture Clark and expose him to the same radical treatment, hoping to reveal his mystery.

When Kennex and Dorian investigate the murder of a "chrome," there are no signs of trauma, other than a very small pinprick on the back of his neck. As the investigation unfolds, it's revealed that the murder suspect is tapping into the DNA of his victims in pursuit of perfection.

Rip tells the team they are headed to the future to take out a powerful ally that Savage needs in order to conquer the world. However, when Rip reveals the ally is a 14 year-old boy (guest star CORY GRUTER-ANDREW) who will one day grow into an evil dictator, the team is split about the morality of killing a child – even if it means saving the world. Meanwhile, Sara talks Snart through a rough patch and Ray learns something that could impact his future with Kendra.

Kyle and Megan must weather a huge rumor that could upend both their careers. Meanwhile, Terence learns something surprising about DeAnn.