Novel series A difference between the radio and TV series occurs in the novels when the Heart of Gold crew arrive on the ancient planet of Magrathea. Marvin inadvertently saves the crew by plugging himself into the onboard computer of a police vehicle, which, when exposed to the true nature of Marvin's view of the universe, commits suicide, taking the two police who were then firing at the ship's crew with it. The crew leave Magrathea on the Heart of Gold, but are teleported summarily to Ursa Minor Beta, where Zaphod's great grandfather, in an apparent fit of vicious humour, forces Marvin to accompany Zaphod on his mission of self-discovery. Marvin subsequently saves Zaphod's life by engaging in a battle of wits with a vicious (yet stupid) automated tank and then is abandoned on the planet Frogstar B when Zaphod is sent to the Total Perspective Vortex. Eventually, the crew arrive at the Restaurant at the End of the Universe (which was built over the ruins of Frogstar B in this continuity) and the story continues as with the TV series.
Novel series A difference between the radio and TV series occurs in the novels when the Heart of Gold crew arrive on the ancient planet of Magrathea. Marvin inadvertently saves the crew by plugging himself into the onboard computer of a police vehicle, which, when exposed to the true nature of Marvin's view of the universe, commits suicide, taking the two police who were then firing at the ship's crew with it. The crew leave Magrathea on the Heart of Gold, but are teleported summarily to Ursa Minor Beta, where Zaphod's great grandfather, in an apparent fit of vicious humour, forces Marvin to accompany Zaphod on his mission of self-discovery. Marvin subsequently saves Zaphod's life by engaging in a battle of wits with a vicious (yet stupid) automated tank and then is abandoned on the planet Frogstar B when Zaphod is sent to the Total Perspective Vortex. Eventually, the crew arrive at the Restaurant at the End of the Universe (which was built over the ruins of Frogstar B in this continuity) and the story continues as with the TV series.