Nestene sphere

A Nestene sphere was a fragment of alien consciousness with the power to animate plastic. It could activate Autons. Portals to other areas could increase the range of the sphere's influence. When the sphere passed through these portals, it closed the portals and made the area safe again.

In the 1980s a Nestene sphere came to Earth to a village. The locals thought that it was a fallen star and built a plastic Christmas village around it. However, all people who came to visit the Christmas village vanished. The Eleventh Doctor heard about it. Together with Amy he came to investigate. When he found the sphere he used it to close the portals, then he put the sphere back into hibernation and transported it to Bakelite, an uninhabited planet. (GAME: The Christmas Trap)