A 77-minute animated film "Agaton Sax och Byköpings gästabud" was made in Swedish in 1976, with a plot loosely based on "Agaton Sax and the Criminal Doubles". An English-language version was broadcast in the UK by the BBC in August 1978, adapted by Daphne Jones, under the title "Agaton Sax and The Feast at Bykoping", and once again featured Kenneth Williams voicing all the characters. Adapted in 3 parts of 25 minutes each, it aired just six months after the transmission of Williams' second "Jackanory" serial, "The League of Silent Exploders", and was repeated in August 1979.