Peter Jones The Book Actor Simon Jones Arthur Dent Actor Bill Wallis Prosser, Prostetnic Vogon Jeltz Actor David Dixon Ford Prefect Actor Geoffrey McGivern Ford Prefect Actor Mark Wing-Davey Zaphod Beeblebrox Actor David Tate Eddie the Computer, Vogon Guard Actor Jo Kendall Lady Cynthia Fitzmelton Actor Susan Sheridan Trillian Actor David Gooderson The Barman Actor Ray Hassett First Computer Programmer, Bang Bang, Magrathean PA Voice Actor Alan J.W. Bell Director