The transition from a half-hour Saturday morning cartoon into a full-length feature film is always a tough sell. It hardly ever works because the attention span of the average child has been reduced to five nanoseconds, making a 22 minute cartoon difficult to stretch. The resulting feature typically looks cheap and underdeveloped on a big theater screen.
In fact, the few successful transitions of series to the big screen have been the Rugrats and South Park cartoons. Why were they successful? Because their creators went beyond the usual scope of TV work to incorporate real story and character development into the feature-length films.
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