Dunn was also a regular on Michael Bentine's madcap sketch show It's a Square World.

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The Goon Show, which also starred Spike Milligan, Peter Sellers and Michael Bentine, was first broadcast in 1949, and enjoyed a nine-year run.

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But he was at his happiest when he was pushing the boundaries of conventional animation, working alongside avant-garde stars such as Spike Milligan and Michael Bentine, hob-nobbing with the Beatles and, later, becoming an inspiration for a young Terry Gilliam.

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