Heart of Gold is the first prototype ship to successfully utilize the new revolutionary Infinite Improbability Drive. It is 150 metres long and shaped like a sleek running shoe, being perfectly white and beautiful. It was built as a secret government project on planet Damogran from where Zaphod Beeblebrox, the then-President of the Imperial Galactic Government, stole it at the launching ceremony.
The ship's cybernetics consist of a new generation of Sirius Cybernetics Corporation robots and computers, with the new Genuine People Personalities (GPP) feature.
In Life, the Universe and Everything, it is revealed that the Improbability Drive is actually the Golden Bail of Prosperity, one of five items that forms the Wikkit Gate. The drive is subsequently stolen by the robots of Krikkit, but is later recovered by Zaphod Beeblebrox and reinstalled.
