In December 1986, the CyberMondans used a circular shaped Cyber-ship to travel from Mondas to invade Earth. (TV: The Tenth Planet)

After Mondas had been destroyed, Professor Allison Williams led a team to study the Cyber-ship. Along with other leftover Cyber-technology, the ship allowed the human race to make large advances in space travel. (PROSE: The Power of the Daleks)