Stasis field

A stasis field was an artificial force field, a second frozen in time. (AUDIO: The Guardians of Prophecy) It kept outside influences from affecting the area within it, keeping the inside from affecting the external world.

One such field surrounded Stockbridge in an alternate timeline from 1950 until 2009. The people within relived past experiences every day and could never die, but these effects could not leave the bubble. But, as the Fifth Doctor said, "eventually bubbles pop" — the walls were destroyed and the timeline was negated when the Doctor and Nyssa escaped, thereby never becoming the possible future versions that turned the village into "hell" in the first place. (AUDIO: The Eternal Summer)

The Silence possessed one in 1969, but it was stolen by River Song, along with a perception filter which was being used to hide their base. She used it to keep herself in a state of suspended animation until the Eleventh Doctor found her two centuries later. (GAME: The Eternity Clock)

Mulkris kept Eldrad's remains in a stasis field as she collected them. (AUDIO: Eldrad Must Die!)

In the ancient times of Gallifrey, a stasis field generator was on board ship Aeon. It was related to the projection of stasis haloes of the fleet responsible for the creation of the black hole which gave the Time Lords control over time travel. (COMIC: Star Death)

The Krulius used a temporary stasis field to seal Bannerman Road. After this he attacked Sarah Jane Smith and her friends with an alien army. The alien army was defeated and the stasis field did not last much longer. The aliens were teleported away. (WC: Defending Bannerman Road)