The Rough Guide to Shabadabadon
From Tardis Wiki, the free Doctor Who reference
The Rough Guide to Shabadabadon was a book that the Fifth Doctor took with him on the way to the famous ice caves of Shabadabadon. He discarded it when he instead landed in the Gogglebox in the far future. (AUDIO: The Gathering) During his sixth incarnation, he returned to Shabadabadon to retrieve the book but was unable to locate it. (AUDIO: The Reaping)
