J.R.R. Tolkien called a sudden joyful turn in a story a “eucatastrophe.”
He introduced and discussed the term in his 1947 essay “On Fairy-Stories.” Tolkien formed it from Greek roots associated with “good” and “down-turn,” presenting it as the opposite of catastrophe. For him, a eucatastrophe was not simply a happy ending or an unlikely rescue; it was a sudden change from apparent disaster to joy that gives a story emotional and moral power.
Tolkien considered this turn especially important in fairy-stories. He argued that the best examples offer a glimpse of joy beyond the immediate fictional world. His discussion is often linked to the moment when the Eagles arrive at the Battle of the Black Gate or when the Ring is finally destroyed, though the concept applies more broadly.
“Eucatastrophe” is distinct from “mythopoeia,” Tolkien’s term for the making of myth, and “sub-creation,” his description of imaginative world-building.