The 4th season had so much potential and they blew it with stupid stories. You really didn't miss much. Anyway, it ended with Clark answering the front door and there was a baby on the porch for him and Lois and of course, no explanation. I hate not knowing where the baby came from, who put it there, why, etc.

After the 3rd season, the show was renewed for a 4th and 5th season but I heard that after the 4th season, Dean Cain and Teri Hatcher didn't want to do the show anymore and with Smallville just starting, I guess the powers to be thought there would be too much Superman.