Recovery 7

Recovery 7 was a recovery craft sent up to Mars Probe 7 to check on their communication equipment and see if the astronauts were fine and well. The craft was taken over by Alien Ambassadors and subsequently flown to Earth. The Third Doctor took control of Recovery 7 for a time so he could fly up and negotiate with the Ambassadors' Leader. In the end the Ambassadors were flown up in the craft to re-join their people and the lost astronauts piloted Recovery 7 to Earth. (DW: The Ambassadors of Death)