Arthur Curry, better known as Aquaman, arrives in town to destroy a new sonar weapon designed by LuthorCorp. Meanwhile, Clark meets Prof. Milton Fine, a.k.a. Brainiac.

Tom Wopat makes a guest appearance as a state senator---and old friend of the Kents---who is linked to the murder of an exotic dancer. The woman told Chloe she had a big story, but was killed before she could pass on any details.