British actor Iain Glen is to guest star on the science-fiction series \"Haven\" next season, Syfy said Wednesday. Glen is best known for his work on TV\'s \"Game of Thrones\" and \"Downton Abbey.\" On the Oct. 26 installment of \"Haven,\" he will portray a \"refined yet bitter man who has been trapped inside his house for more than 27 years,\" a synopsis said. Based on Stephen King\'s novella \"The Colorado Kid,\" \"Haven\" follows former FBI agent Audrey Parker, who becomes a police officer in the small town of Haven, Maine, and soon discovers its many secrets. The show stars Emily Rose, Lucas Bryant and Eric Balfour. Season 3 of the show is to begin Sept. 21.