S10E10
Episode 10: Luthor
⚠ Spoiler alert This recap gives away what happens in this episode.
Episode Summary & Review
Clark is transported to a parallel universe by a kryptonian box that once belonged to Lionel Luthor. In this world, he has been adopted by the Luthors instead of the Kents and has grown up to be a killer. Without tipping his hand, Clark looks for a way to get back to his own universe, where he has been replaced by his murderous double.