Season four ended up being the final season of Lois and Clark. It was not intended to be the final season, but the show was canceled after the season had already aired, so the writers were not able to really give it a proper wrap-up. The season starts with two episodes that resolve the new krypton storyline that acted as the season three cliffhanger and then in the third episode resolves the "fake" wedding from season three. The series mostly keeps the story of the week format, but there are many storylines that play out over the course of two episodes this season. The show does bring back the best villain who is not Lex, Tempus (played wonderfully by Lane Davies), and John Shea does return to voice Lex in a couple of episodes but does not make an in-person appearance. The show also introduces Mxyzptlk (played by Howie Mandel) in the Christmas episode. There are several recognizable guest stars including Delta Burke, Jack Larson (who played Jimmy in the 1950s series), Drew Carey, William Christopher (from M*A*S*H), and Harry Anderson (from Night Court), among others. The series ends on a pretty big cliffhanger that, of course, was never paid off because of the cancelation, so it really does feel incomplete.
For those who get the DVD set, the only extra is a trivia game. There are no behind-the-scenes material or commentary tracks, or any other bonus features similar to what was included in the prior season releases. So, if you only get the physical discs when there are a lot of extras, that is something to keep in mind.
Overall, the season was okay, but not great. Definitely not as good as the first two seasons (which, in my opinion, were the best seasons of the show), or even as good as the third. The ancillary characters like Jonathan, Martha, Perry, and Jimmy were relegated even more to sidekick status than they were originally, and I think the show hurt from the lack of a "main" bad guy. They tried to turn Tempus into that main foil by bringing back Lane Davies multiple times, but I think not having Lex (or someone like Lex) every week causing trouble took something away from the show. Ending the season on a mild cliffhanger was not ideal, but the cliffhanger worked about as good as one in a series finale could. But, it is obvious that the writers intended it to lead into the fifth season. I do think it is worth watching, especially for those of us who were fans when it aired on TV, as long as you temper your expectations for the season knowing that it does not get a proper finale.