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Episode Guide

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Smallville - Season 5, Episode 4
A summer beach party at Crater Lake takes a dramatic turn when Lois (ERICA DURANCE) hits her head while jumping into the lake. Before Clark can save her, a mysterious swimmer named AC (ALAN RITCHSON) comes to her rescue, out-swimming Clark and leaving him baffled. Professor Fine (JAMES MARSTERS) tells Clark that Lex is behind a covert weapons manufacturing operation. AC breaks into a LuthorCorp facility in an attempt to destroy one of Lex's dangerous experiments and is captured by Lex.