The Saturnius was a spacecraft that left Earth to investigate the sudden appearance of a mysterious planet.

It collided with the Doctor's TARDIS and the planet itself, causing temporal anomalies and affected the crew's memories, meaning that River Song, a freelance aboard the ship, did not recognise the Seventh Doctor and he was believed to be a stowaway. With his help, the situation was resolved, reversing time to just before the crash, allowing both River and the Doctor to change the courses of their ships, preventing the crash. After that, thanks to River upgrading the shields, the ship was able to land successfully on the planet, which the crew soon discovered was a devastated version of Earth. (AUDIO: The Unknown)

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