The popular stories were first made into an animated TV series in 1975 and have been reimagined a number of times.

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And Kurt Scherf, an analyst at Parks Associates, used the example of an animated TV series about a futuristic family to explain why it hasn't taken off.

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Scooby-Doo, a Great Dane who leads a group of teenagers in ghost-hunting adventures, made his debut in 1969 and the series ran for 17 years, a record for a TV animated series.

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Angry Birds maker Rovio plans to release its first animated series later this week across mobile devices, TV channels and streaming media boxes.

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