origin story
[awr-i-jin stawr-ee, or-i-jin]
- a backstory, or established background narrative, that informs the identity and motivations of heroes and villains in a comic book or similar fictional work: The superhero’s origin story begins with a tragic accident that left him scarred, but also resulted in his supernatural powers.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018