Marvin reappears in the second-to-last chapter of So Long, and Thanks for All the Fish. Arthur and Fenchurch find him on the planet where God's Final Message To His Creation is located. He is barely functional, claiming that, due to time travel he is now "thirty-seven times older than the Universe itself." Every part of his body has been replaced, with the exception of "all the diodes down [his] left side," which have been giving him severe pain for the whole of his existence. Arthur and Fenchurch end up carrying him, enduring the robot's constant abuse, to the God's Final Message viewing station, where they lift him up to see the words of the message: "We apologise for the inconvenience." Astonishingly, Marvin responds "'I think... I feel good about it.'" The lights in his eyes go out and his already-worn circuits completely stop working; Marvin is no more. (In the radio dramatisation, his last words are "Goodbye, Arthur." Marvin's 'death' prompts Arthur to say, "Miserable git!" and then, to his own obvious astonishment, to add, "I'll miss him.")
