Zoe and Jo are back in Eureka. But things don't look the same on the episode "Omega Girls."
Jo and Zoe return to Eureka in this scene. They are shocked by what they discover.

Eureka Season 4 Episode 15 Quotes

Zane: Can I ask you something I can't really talk about with anyone else?
Henry: If it has to do with sexual mechanics while in zero-g... No.
Zane: Not that, although, now I have several questions.

Henry: That's disconcerting
Jack: It's bad isn't it? What is it? Subdermal hematoma, pheocromacytoma, concussion... Uh, there was a House marathon on last night.