The Long Sleep is the 23rd broadcast and the 26th produced episode of British television series UFO.
A girl named Catherine begins to recover from a ten-year-long coma, originally caused by a road accident in which Straker was the driver of the car. She begins to recall events just prior to her accident, and tell them to the men from SHADO. A man named Tim, an encounter with aliens, a bomb buried at a farmhouse, suddenly the ten-year-old mystery attains a new urgency when it is discovered that the man Tim is alive and under alien control. He is planning to find the farm and explode the deadly bomb, and he must be stopped!