Cyberman

Encounter on the Time Controller ship
Main Article : Resurrection of the Cybermen

The last surviving Cybership finds a Time Controller being transported by a human cargo ship. They send 5 Cybereggs to the chief of Science on board, who examines and duplicates the eggs. They all hatch Cybermen, who immediately kill the scientist and begin to make people disappear. The Doctor eventually stops them.

External Sources
TARDIS Wikia