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After three full seasons, the Wraith -- the big bad guys of the Pegasus Galaxy -- still have a place in the "Stargate: Atlantis" universe. It's just that now, they're getting a bit bigger, and even more bad.

New sets have been built featuring a much sleeker look for the life-sucking villains, but it seems only certain members of the cast and crew even know what they look like.

Brigitte Prochaska, the unit publicist for "Stargate: Atlantis," mentioned the new Wraith sets while giving online journalists a tour of Bridge Studios where "Atlantis" is filmed Tuesday morning as part of SciFi Channel's Digital Media Tour. Unfortunately for the journalists, however, the new Wraith sets were not a part of the overall tour.

The Wraith also will be getting a bit sexier, however. "Atlantis" costume designer Valerie Halverson showed off some new costumes, including a stunning dress for a Wraith queen that is both "regal and ominous," she said.

The Atlantis crew will get some adjustments to their uniforms, including some new traveling clothes for characters such as Ronon (Jason Momoa) and Teyla (Rachel Luttrell).

"We simplified a lot of the color contrasts," Halverson said of the new expedition uniforms. Amanda Tapping, who moves her character of Samantha Carter over to the show from "Stargate SG-1," will also get a new uniform that will include leather when she is out on missions, and a look similar to former Atlantis expedition chief Elizabeth Weir (Torri Higginson), but "softer."

With Tapping joining the show, there is some concern that "Atlantis" may become too much like "SG-1," but fans don't have to worry.

"We share the same mythology, and there are going to be similarities," said David Hewlett, who plays Dr. Rodney McKay on "Atlantis."

"I think that's a good thing. We don't need to be completely different because there are still more stories to tell from a different angle, a different perspective."

And Tapping may not be the only "SG-1" castmember making the jump over to the spinoff. The door is open for others to make at least a brief appearance if not more, said executive producer Joseph Mallozzi.

"Because the show shares a mythology, there are elements that will always overlap in terms of characters," Mallozzi said. "We'll hopefully get some other 'SG-1' characters to make cameos, if we can work it out creatively."

But that's where it will end. Don't expect the Ori and the Goa'uld to suddenly stop by for tea, Mallozzi said.

"'Atlantis' has established its own burgeoning [enemies] like the Wraith and the human-form Replicators. We don't want to go there right now" with moving them to "Atlantis," Mallozzi said.

"Stargate: Atlantis" returns with its fourth season this fall.

Keep reading Airlock Alpha all week for all the latest on SciFi Channel's press tour in Vancouver, B.C., highlighting shows such as "Battlestar Galactica," "Stargate: Atlantis," "Eureka," "Flash Gordon" and more.