Plot summary
Clark is on his way to New Krypton when he and the Kryptonians find out that Lord Nor ( Simon Templeman ) has landed on Earth planning to conquer it. Clark heads back to Earth while Lord Nor started his plan from Smallville, making all its people slaves and demands the rest of the world to obey him. Clark and Lois decide to go undercover to Smallville as slaves to find out more about Lord Nor's plans and to help the people. Things seem to go as plan till the moment Lord Nor finds out who Superman's parents are and captures them asking Superman to surrender. Clark shows himself to save his parents asking Lord Nor what he wants and Lord Nor says that he wants Kal-El dead and his throne.
Credits
Adapted from Wikipedia contributors, Lois & Clark: The New Adventures of Superman season 4. HTML formatting and reference markers removed.