In season 3, Clark and Lois are now working at the Smallville Gazette together and enjoying small town life. However, Lois' work-life balance is put to the test when an undercover assignment reveals a deadly foe that promises to change the Kent family forever. Meanwhile, the Kent boys find themselves being pulled in opposite directions as Jordan discovers what a superhero-identity really means and Jonathan searches for purpose beyond the football field. Amid all this upheaval, John Henry is haunted by his doppelgänger's past, leading to dangerous consequences for him and Natalie.
Lois' undercover assignment reveals a deadly foe that promises to change the Kent family forever. Meanwhile, the Kent boys find themselves being pulled in opposite directions.
Lois and Chrissy pursue a new lead in the Mannheim investigation against Clark's wishes. Meanwhile, Jonathan, Jordan, and Nat face an unexpected obstacle.
Clark and General Lane are both having a hard time giving Lois room to make her own decisions. Meanwhile, Lana and Sarah have a run-in with an old friend at the diner.
Lois and Clark dig deeper on Bruno Mannheim, starting with his connections to Hob's Bay Medical Center, while Jonathan and Jordan panic at home over Lois' dire diagnosis.
After learning about Bruno and Peia, Clark works to reignite Lois' interest in taking Bruno down; elsewhere, Natalie meets Matteo's parents, with disastrous consequences.
Superman and John Henry clash over how to handle Bruno Mannheim, while Lois worries over upcoming treatments and confides in Lana about her early courtship with Clark.
Finally, after seventeen years behind bars, Lex Luthor is set to be released from prison. Lois and Clark clash with Jordan over his carelessness around using his powers in public, while Jonathan struggles with Kyle's change in behavior at the firehouse.