The list of 'Girls' season 4 guest stars is getting longer and longer, first with the announcement of 'Community' vet Gillian Jacobs, and now with fan-favorite 'American Horror Story' and 'Star Trek' star Zachary Quinto. The 'Heroes' actor will guest in an upcoming episode of the HBO Brooklyn dramedy, but as whom, you wonder?

Quinto was first observed on the Brooklyn set by Us Weekly, filming scenes alongside series writer, creator and star Lena Dunham, both adorned with volunteer smocks saying, "Ask Me My Name," as they picked up trash. True to form, HBO wouldn't cough up any official details of the role, though we know for sure at least that Quinto will only be present for a solitary episode.

Elsewhere, we know of ‘Girls’ season 4 that production will likely return to the 10-episode format over season 3′s elevation to 12, while series star Andrew Rannells will enter season 4 promoted to series regular, and Adam Driver will remain a regular despite his ‘Star Wars‘ casting. We’ll also see Hannah undertaking the Iowa writers’ graduate school program that became a focus of the season 3 finale, despite the fact that the actual Iowa University denied Dunham the opportunity to film there. Additionally, 'Parenthood' star Jason Ritter will play a small part, while Marin Ireland of ‘Homeland,' young filmmaker Desiree Akhavan and actor Peter Mark Kendall have been given recurring roles as fellow students in the writing program.

'Girls' season 4 won't arrive until 2015, but in the meantime, what say you? What other big names would you want to see hanging with Hannah in the future?

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