Stan Lee, Ming Na

Stan Lee will guest-star on Syfy's Eureka, TVGuide.com has learned exclusively.

Lee hinted at a cameo on the sci-fi series — which was just renewed for a fifth season — on his Twitter account Tuesday, saying he was rushing to Vancouver to film a guest spot. Syfy is keeping mum on who or what the comic book legend will play.

Syfy renews Eureka for season 5

The network has, however, firmed up the role of Ming-Na (Stargate Universe), who will also guest-star next season.

The actress will portray Alice Wen, a senator who arrives in Eureka to handle a sensitive matter within Global Dynamics. She may appear in more than one episode.

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Lee and Ming-Na join a list of guest stars next season that already includes Wil Wheaton, Jamie Kennedy, Chris Parnell, Felicia Day, Jaime Ray Newman, and former cast members Ed Quinn and Matt Frewer.

The fourth season of Eureka is averaging 3 million viewers. The show airs Fridays 9/8c.