The 8th episode of "Smallville" Season 8 airs in the U.S. on Thursday, November 6th, 2008 at 8.00pm. Titled
"Bloodline", here's the official (spoiler filled) description from The CW...
KARA RETURNS - Clark (Tom Welling ) receives an anonymous package containing the crystal that Tess (Cassidy Freeman) found in the Arctic. When he removes the crystal, it activates and sends him and a visiting Lois (Erica Durance) to the Phantom Zone where they run into Kara (guest star Laura Vandervoort). Kara opens a portal for Lois to return but Zod's wife Faora escapes with her and takes over Lois' body. A possessed Lois goes on a rampage in Metropolis. Allison Mack, Aaron Ashmore and Justin Hartley also star.
Directed by Michael Rohl
Written by Caroline Dries
Bloodline Trailer
Director's Clip
Bloodline Web Clip
Meanwhile, TV Guide has the following description for this same episode...
The Arctic crystal is anonymously delivered to Clark, and it sends him and Lois to the Phantom Zone, where they run into Kara. She returns Lois to Earth, but inadvertently releases Zod's wife, who takes over Lois' body and wreaks havoc on Metropolis.
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