Timelash is the 21st broadcast and the 24th produced episode of British television series UFO.
As Straker returns to SHADO headquarters with Virginia Lake, they notice that everything around them is totally still, frozen in time. They only prevent the same thing happening to themselves when Straker rushes to the laboratory and injects them with a chemical solution to speed up their actions. Suddenly, a challenge rings out. The time stoppage is the latest attempt by aliens to destroy Straker and SHADO, engineered by the human, Turner. Now Straker, Virginia, and the evil Turner must battle it out in a timeless moment in which no-one else can interfere!