Syfy's Eureka has always been a hotbed of geeky activity, and the trend will continue this summer. Gamer girl Felicia Day, star trekker Wil Wheaton and comic book legend Stan Lee will all make an appearance in the second half of the show's fourth season.

Eureka returns to Syfy on July 11th, over six months after its mid-season finale in December. The show forms one-third of the network's lineup of premieres the same night, being followed by Warehouse 13 and the Alphas series premiere.

Both Day and Wheaton will be a major part of the new half-season, with each getting a seven-episode story arc to themselves. Day's episodes as Department of Defense contractor Dr. Holly Marten begin a week after the premiere, while Wheaton's will reprise his role as Dr. Parrish later this year. (Ph.D.s are thick on the ground in Eureka.) Stan Lee will have a cameo appearance on the July 25th episode.

Felicia Day got her geeky start as a recurring recruit on the last season of Buffy The Vampire Slayer. Since then, she's had small parts in various movies and TV shows, but her true notability comes as an online video starlet, beginning with her own World of Warcraft-inspired series The Guild and Joss Whedon's short Dr. Horrible's Sing-Along Blog.

Lately she'd been taking a lot of lead fantasy roles, like Syfy's TV movie Red: Werewolf Hunter and the web series Dragon Age: Redemption. As a frequent Whedon collaborator, it's no surprise that she's rumored to play Agent Abigail Brand in the upcoming Avengers.

Wil Wheaton is best known for his seven years as Wesley Crusher on Star Trek: The Next Generation. While the Wesley character is seen by most as the weakest part of TNG, the actor has grown beyond the teenage role to become a respected voice in science fiction and technology circles on the web. These days he lends his voice to cartoons like Family Guy and Batman: The Brave and the Bold, as well as self-referential appearances on The Big Bang Theory.

Stan Lee needs no introduction, but in case you've been living under a rock for the last forty years, he's the creator of iconic Marvel superheroes like Spider-Man, The Incredible Hulk and X-Men. Lee serves as an executive producer on many Marvel movies and animated TV shows, and has short cameos in many Marvel projects. He's appeared as himself (usually with some good-humored self-deprication) on everything from The Simpsons to Entourage... and The Big Bang Theory.

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Eureka premieres Monday, July 11th at 8PM on Syfy.

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Photo credit: Wil Wheaton