From Superman to super librarian.

“Smallville” actress Kristin Kreuk co-stars in the Fox drama “Murder in a Small Town” returning for Season 2 on Sept 23 (8 p.m. on Fox).

In the show, she plays librarian Cassandra, who is dating the local police chief, Karl Alberg (Rossif Sutherland).

“We have wonderful chemistry. It’s fun, it’s easy, he’s a pro,” Kreuk, 42, exclusively told The Post. “I think it’s really lovely that we get to play this relationship between these two characters as they are in mid-life, and really have a mature relationship.” 7

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“For Cassandra, it’s really her first serious relationship since she was in her 20s,” the “Beauty & The Beast” actress added. “So, it’s nice to really dig into what it means to have a relationship at this point in our lives.”

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