US film star Christian Slater is to appear in the radio series of the Hitchhiker's Guide to the Galaxy.
Christian Slater is currently appearing on Broadway
The actor joins the cast for the final episode in the BBC Radio 4 production, which begins on 3 May.
He will play John Watson, also known as Wonko the Sane, a character who lives in an inside-out house.
Hitchhiker's Guide to the Galaxy started out as radio play in 1978, before Douglas Adams' turned it into a hugely successful book.
An updated movie version hits UK cinemas on 28 April, starring Martin Freeman as the hero Arthur Dent.
The radio series is based on Adams' final two books and will also feature the voice of the late author as Agrajag , recorded before his death in 2001.
Sandra Dickinson, Trillian in the TV series, is also in the radio finale
Actors from the original 1978 radio series, Simon Jones and Mark Wing-Davey, are among cast members returning for the final radio series.
They are being joined by Sandra Dickinson and David Dixon, who starred as Trillian and Ford Prefect in the 1980s TV version.
Stephen Fry, Jackie Mason and Jonathan Pryce had already been announced as cast members but producers promised a "Hollywood heart-throb" was also going to be involved.
Slater, 35, recently made his West End debut in a critically acclaimed production of One Flew Over the Cuckoo's Nest.
He is currently starring on Broadway in The Glass Menagerie, alongside Jessica Lange.