Suspended animation

Suspended animation was the temporary cessation of a life form's vital functions, often used to transport individuals from one time period to another without ageing.

Humans placed themselves in suspended animation on the Nerva Beacon in order to survive the solar flares that devastated Earth. (DW: The Ark in Space) Millions of years later, much of humanity was miniaturised and placed in suspended animation on the Ark to survive the long voyage to Refusis II. (DW: The Ark)

Davros was sentenced to be placed in suspended animation as punishment for his crimes. (DW: Resurrection of the Daleks) Tranquil Repose placed dying millionaires and politicians in suspended animation until cures for their conditions could be found. (DW: Revelation of the Daleks)

The Seventh Doctor once spent unspecified millions of years in a coma, frozen within a block of ice. Though his clothing had mostly rotted away over the years, his body survived and he recovered fully. (BFA: Frozen Time)

Non-Human use of Suspended Animation

 * Azal (DW: The Dæmons)
 * Chameleons (DW: The Faceless Ones)
 * Cybermen (DW: The Tomb of the Cybermen, Attack of the Cybermen)
 * Daleks (DW: Planet of the Daleks)
 * Davros (DW: Destiny of the Daleks)
 * Ice Soldiers (DW: The Keys of Marinus)
 * Ice Warriors (DW: The Ice Warriors)
 * Josiah Samuel Smith (DW: Ghost Light)
 * Kane (DW: Dragonfire)
 * Krotons (DW: The Krotons)
 * Kulan (EDA: Escape Velocity)
 * Malus (DW: The Awakening)
 * The Seventh Doctor (BFA: Frozen Time)
 * Silurians and Sea Devils (DW: Doctor Who and the Silurians, The Sea Devils, Warriors of the Deep, The Hungry Earth/Cold Blood)
 * Three Sleepers (DW: The Mysterious Planet)
 * Veil (SJA: The Vault of Secrets)