Christian Slater is to appear in the final episode of the new radio version of The Hitchikers Guide To The Galaxy, scheduled to be transmitted on the 3rd of May.
He will play John Watson, also known as Wonko the Sane, who has built an asylum - and put the world in it so it can recover from it's problems, poor thing.
This version of the radio play followd the original radio play, which was in turn followed by A Book Trilogy In Five Parts, a TV series, and now the movie.
The movie, released 29th April, stars Martin Freeman as Arthur Dent, Bill Nighy as Slartibartfast and Stephen Fry as the voice of the Guide.
Christian Slater will be appearing alongside original radio cast members Simon Jones and Mark Wing-Davey, as well as Douglas Adams himself, who recorded the part of Agrajag before his death in 2001.