Marvel's Guardians of the Galaxy is shooting in London, but it's evidently not too late for casting news, with actor Gregg Henry revealing Sunday on Twitter that he's heading to the United Kingdom for an unspecified role in the film.

Henry previously worked with Guardians writer/director James Gunn on 2006's Slither and 2010's Super, and voiced a character in Gunn-penned video game Lollipop Chainsaw. He's currently in the recurring role of Hollis Doyle on ABC's Scandal, and recently appeared on the third season of AMC's The Killing.

Guardians of the Galaxy stars Chris Pratt as Peter Quill, aka Star-Lord, Zoe Saldana as Gamora, Dave Bautista as Drax the Destroyer, Lee Pace as Ronan the Accuser, Michael Rooker as Yondu, Karen Gillan as Nebula, Djimon Hounsou as Korath, Benicio del Toro as The Collector, John C. Reilly as Rhomann Dey, and Glenn Close as Nova Prime. It opens Aug. 1, 2014.