Danger Mouse was a British animated television series produced by Cosgrove Hall Productions. It featured the eponymous Danger Mouse who worked as a secret agent and was a parody of British spy fiction. It originally ran from 28 September 1981 to 19 March 1992. Danger Mouse was a secret agent with the British Secret Service, and together with his sidekick Penfold they were repeatedly ordered by Colonel K, the head of the Secret Service, to save the world. They worked underneath Scotland Yard on Baker Street in London, hidden inside a red pillar box. Danger Mouse (voiced by David Jason) – Often called the world's greatest secret agent—so secret, in fact, that his codename had a codename. His catchphrases included "Good grief" when he became upset or shocked, "Penfold, shush" when his assistant made a foolish remark. Ernest Penfold (voiced by Terry Scott) – A timid, bespectacled hamster, was Danger Mouse's reluctant assistant and sidekick. Brian Cosgrove described Jason's portrayal as "His voice had the perfect mix of forcefulness, humour and gentleness. He was totally committed to doing voiceovers for silly cartoons, which warmed my heart, and we became great friends." Jason said "I wanted to make him sound believable. We decided he would be softly spoken, very British, very heroic, but also a bit of a coward. He'd save the world, but he'd also run for it!