Amazon.com description: Product Description: This really is the ultimate answer to life, the universe and everything -- all five radio series of The Hitchhikers Guide to the Galaxy collected together for the first time. From the original Primary and Secondary Phases through to the more recent Tertiary, Quandary, and Quintessential Phases, these are the adventures of Arthur Dent, Ford Prefect, Zaphod Beeblebrox, and their assorted human, robotic, and alien companions. These full cast BBC Radio 4 dramas star Simon Jones, Peter Jones, Geoffrey McGivern, Mark Wing-Davey, Stephen Moore, and Susan Sheridan, with a stellar guest cast including John le Mesurier, Joanna Lumley, Christian Slater, Jackie Mason, Sandra Dickinson, Rula Lenska, Griff Rhys Jones, and Jonathan Pryce.