Hannah Marks has joined BBC's upcoming "Dirk Gently" television adaptation as Amanda Brotzman, Todd Brotzman's sister. Deadline describes the character as "a former rebellious punk and fun gal, now sick, sidelined by a genetic disorder."

"Jupiter Ascending" alum Samuel Barnett was recently cast in the title role and "Lord of the Rings" star Elijah Wood will play his assistant and Amanda's brother, Todd. The show will follow the pair "as they wend their way through one big, seemingly insane mystery a season, crossing unlikely paths with a bevy of wild and sometimes dangerous characters, each episode landing them a few random steps closer to uncovering the truth."

"Chronicle" screenwriter Max Landis will adapt Douglas Adams' 1987 novel "Dirk Genty's Holistic Detective Agency" and its sequel "The Long Dark Tea-Time of the Soul" for television. The series is co-produced by AMC Studios, Ideate Media, Circle of Confusion and IDW Entertainment, the comic book publisher responsible for the latest adaptations under writer Arvind Ethan David and artist Ilias Kyriazis.

The eight-episode "Dirk Gently" adaptation will air on BBC America in the US.