Clark exploring his ghosts so he can make progress.

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Expect more than one blast from the past as “Smallville” begins its 10th and final season on Sept. 24.

“Our theme this year is really Clark exploring the ghosts of his past so he can move on,” says Brian Peterson, executive producer of the series, which airs on The CW.

For years, Clark Kent (Tom Welling) has moved ever closer to his role as Superman — and to the love of his life, Lois Lane (Erica Durance). As that future beckons, one star making a return appearance is John Schneider, who played Jonathan “Pa” Kent; his character died in Season 5.

“He returns in a very emotional scene,” said Peterson’s fellow executive producer, Kelly Souders. “I just watched it cut together for the first time the other day and it made me get up, cross the room and get a Kleenex, actually. And I don’t cry very easily. But it’s really moving to see both of those actors and both of those characters on-screen together again.”

Pa Kent isn’t the only father figure making a return appearance; also look for John Glover, as Lex Luthor’s dad, Lionel, to come back.

“We have him for at least two episodes, but hopefully more,” Peterson said.

Laura Vandervoort, who played Clark’s Kryptonian cousin Kara, will also return.

“Clark will see she’s a little bit closer to becoming the Supergirl everybody knows from the comics,” Souders said.

In doubt is the return of two stars who were central to the series for several seasons: Kristen Kreuk as Lana Lang and Michael Rosenbaum as Lex Luthor. They both left as cast regulars at the end of Season 7.

“We would love to have them back, and literally that’s all we can say,” Peterson said. “It’s not in our court; we have done everything in our power to get them back.”

Amid all the returns, one longtime character is exiting. Allison Mack, who plays Clark’s friend Chloe Sullivan, is leaving the cast. She’s the only remaining star other than Welling who has been with the show since the beginning.

“She’ll be in the premiere, then back again around midseason and, hopefully, toward the end of the season,” Souders said.

For Peterson and Souders, who have worked on the show since Season 2, the final season is bittersweet. It allows them to pull out all the stops and have Clark finally embrace his destiny. At the same time, Souders said, “being on the show for this long and working with the people that we work with, it really is a tight-knit group. And there’s something very strange about knowing that a year from now, when we walk down the halls, it will be with strangers.”

The producers of “Lost” touted that they had that series’ final image in mind since the beginning. Has the ending of “Smallville” been locked in?

“There are a couple of thoughts that Al and Miles (series creators Alfred Gough and Miles Millar) had that they shared with us back in the day, and we had several,” Peterson said. “So it will really be about how do we best realize a combination of all those visions? I don’t think anybody will be disappointed, that’s for sure.”