SPOILER WARNING: This article contains spoilers for this week's episode of "The Guild."

So how does one follow last week's episode of the popular web series, "The Guild," which featured a cameo by nerd icon (and genuine nerd himself), "Castle" star Nathan Fillion? By bringing in an iconic author, of course.

Neil Gaiman, best known to fans for writing the comic book series "Sandman," as well as the novels "Stardust" and "Coraline" (both of which were made into feature films) is guest starring on this week's episode.

It's pretty rare for Gaiman to make a cameo, and series creator/star (and Gaiman fan) Felicia Day told CNN how this came about. "It was a complete coincidence that we were able to get him while he was in Los Angeles - fate had our schedules synch," she said. "What surprised me is that he's a great actor! In fact, he added a bunch of dialogue that we kept in the scene, and his reactions were so great we used every second of his performance on film."

Also guest starring in the episode, available on MSN, XBox Live and Bing this week, are Erin Gray, of "Buck Rogers in the 25th Century" and Richard Hatch from the original "Battlestar: Galactica."

Guest stars or not, fans download episodes of "The Guild" (to the tune of 100 million views so far) because they find it to be an accurate, and humorous take on the gaming community.

"When I sat down to write 'The Guild,' I tried to create characters that represented the people I played with in my experiences gaming online," said Day. "To me, the cliche of the 'dude in the basement' isn't representative of what real gaming is. Mothers game, young girls game, professional men game, it's a hobby that covers the gamut of age, race and gender. I am proud to be able to help expand the perception of what a gamer is with the show, at the same time giving those unrepresented gamers a fictional character to laugh at because they recognize them from their own experiences."