Michael Hogan, of Battlestar Galactica fame, guest stars on the episode "Patriot." He portrays Colonel Slade.
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Alan Ritchson is seen in this shot from the episode "Patriot." The character makes a major comeback on the final season of Smallville.
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Alan Ritchson returns to Smallville on the episode "Patriot." He reprises the iconic role of Aquaman.
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Why is this photograph significant? Because it's a shot of the video Ella Lane recorded for her daughter.
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Christine Welles appears on the episode "Abandoned." As Granny Goodness she causes problems for Tess.
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Tom Welling is seen here as Clark, courtesy of a scene from the Smallville episode titled "Abandoned."
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Lindsay Hartley makes a significant guest-starring appearance on Harriet on the episode "Abandoned. She causes problems for Clark and Tess.
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Surprise, Clark and Lois! The latter's father stops by for Thanksgiving on the episode "Ambush."
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This is the first photo we've come across of Lindsay Hartley. The actress will play Mad Harriet on the show.
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Erica Durance is seen here as Lois Lane. She's anchored the show for years, of course.
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Los is transformed into the goddess Isis on the aptly-titled episode "Isis." She develops her own powers as a result.
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Oliver Queen takes on his Green Arrow persona in this episode still. It's from the installment "Isis."
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Smallville Quotes

When we first met Black Canary she was nothing more than Lex Luthor's little organ grinder monkey. I mean, do you ever look to see who the bad guys really are before you start throwing knives and spin kicks there chickadee?

Lois

Like they say, you can't go home again.

Clark Luthor