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It’s also called “the Monomyth”. There’s a good breakdown of its basics on Wikipedia. (NB: apparently some of the citations on the Wikipedia article are being checked for accuracy.)
The Monomyth is having something of a “vogue period” at the moment. In screen writing, in particular, you will find people who are desperate to try to shove your screenplay into this model and make it fit, whether it belongs in there or not. (eyeroll)
[tags]monomyth, Campbell, hero, journey[/tags]