The correct phrasing is "The young hero’s recent release" because the possessive form "hero’s" is required to indicate ownership, and "recent" describes the release.
The sentence "The young hero’s recent release" is the correct phrasing, as it correctly uses the possessive form and appropriately describes the release.
Among scientists, the discovery of the double helix structure of DNA and the genetic code it incorporates is widely regarded to be one of the most significant scientific discovery of the twentieth century.