Camp ornithologist Professor Inigo Tinkle (Frankie Howerd) tells a less-than-enraptured audience about his most recent ornithological expedition to the darkest, most barren regions of the African wilds in search for the legendary Oozlum bird, which is said to fly in ever decreasing circles until it disappears up its own rear end. Financing the expedition is Lady Evelyn Bagley (Joan Sims) and the team are led by the fearless (and lecherous) Bill Boosey (Sid James) and his slow-witted African guide Upsidasi (Bernard Bresslaw). Also on the expedition is Tinkle's idiotic assistant, Claude Chumley (Kenneth Connor) and June (Jacki Piper), Lady Bagley's beautiful but unappreciated maidservant. The journey does not get off to a good start, with a mad gorilla terrorising the campsite and the travellers' realising they have ventured into the territory of the bloodthirsty "Noshas", a tribe of feared Cannibalism.