Warning: This article contains SPOILERS for Superman & Lois season 4, episode 10.Superman & Lois season 4, and the DC series as a whole, has now ended with a major Superman rule being broken after a long time. Doomsday and Lex Luthor fight the Man of Steel in Superman & Lois‘ series finale. In the end, both characters would come to have very different outcomes in their stories. Doomsday sacrifices himself after the part of Bizarro within the monster remembered his family and chose not to be Luthor’s weapon any longer. As for Michael Cudlitz’s Lex Luthor, the character lost a direct fight to Tyler Hoechlin’s Superman.

https://screenrant.com/dc-superman-and-lois-ending-rule-broke-death-permanent-85-years/