Skylab

Skylab was the first American space station, launched in 1973. The Tenth Doctor claimed to have been involved in its construction. (DW: Tooth and Claw)

In 1979, the now-abandoned Skylab was used by the Zalphons as their base, but an accident on board caused it to crash back to Earth, the debris falling in western Australia. The Tenth Doctor, with the assistance of young Harvey, defeated the Zalphons. (DWS: Bennelong Point)

One piece of Skylab threated to kill Paul Forbes, who was in the Gibson Desert, but he was saved when the Seventh Doctor advised him to take three steps to the left. (BE: Three Steps to the Left)