Tom Thumb Tempest is the 22nd broadcast episode and 21st produced episode of British television series Stingray.
While awaiting orders for a mission, Troy falls asleep. When he awakes, the Stingray crew are sent on a mission. Soon, they find themselves in a fish tank in a dining hall. The crew have shrunk! Titan and some underwater races have stolen plans for Marineville. Troy manages to call Commander Shore who doesn't believe their story, so the Stingray crew must come up with a plan to destroy the Marineville plans.