Matthew Harrison

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.

While Carlos struggles emotionally, he and Kiera must stop Liber8 from unleashing a chemical attack on the city.

This week an all new episode of DC's Legends of Tomorrow.

The investigation into the murder of a chrome leads Kennex and Dorian to discover a serial killer using his victims' DNA to pursue perfection.

Kyle and Megan must weather a huge rumor that threatens to upend both their careers; Terence learns something surprising about DeAnn.