Episode 8x17: Hex
The CW's Official Description (Posted 3/5/09): IT’S FREAKY FRIDAY FOR CHLOE AND LOIS WHEN DC CHARACTER ZATANNA APPEARS — At Chloe’s (Allison Mack) birthday party, a mysterious magician named Zatanna (guest star Serinda Swan) grants Chloe’s wish to be more like Lois (Erica Durance) and switches the two into each other’s bodies. Zatanna searches for her father’s book of spells so she can conjure up his spirit but not before also granting Clark (Tom Welling) his deepest wish. Aaron Ashmore and Justin Hartley also star. Description posted on KryptonSite. Mairzee Almas directed the episode written by Bryan Q. Miller (#3T7467).
UPDATED 3/5/09: Even though the official description contradicts this, we still are under the impression that it's not a direct body swap - Allison Mack will not be playing Lois.
- Even though a majority of Erica Durance's sceen time is as Chloe-as-Lois, Lois is present for Chloe's birthday party before leaving town on a story. She returns at episode's end and shares a scene with Clark.