"It will explore a little bit of the past, the present and the future," Peterson said. "We kind of do a little look back to where we've been and we also take a look at where Clark is going."
Meanwhile, Peterson revealed that the episode includes "one big event", adding: "You have to wait for the last few minutes for it."
Apparently we should also look for James Marsters to reprise his role as Brainiac that week, "You get to see a little bit of the old villain that we all love," said fellow producer Kelly Souders. "But with a new twist."
Smallville premieres its 10th and final season on September 24 on The CW.
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