Smallville (2001)

S10E10 Luthor

Tess stumbles upon a Kryptonian artifact that originally belonged to Lionel Luthor. When Clark inadvertently triggers the device, he is whisked away to an alternate reality where Lionel discovered him in the cornfields, rather than being raised by the Kents. In this world, Clark Luthor has embraced a life of crime, while Lois is engaged to Oliver and harbors a deep resentment towards Clark. Determined to return home, Clark must navigate this dangerous landscape without revealing that he is not the son Lionel believes him to be, all while the nefarious Clark Luthor takes his place back on Earth.