deus ex machina (plural dei ex machina or dii ex machina or di ex machina or dei ex machinis or dii ex machinis or di ex machinis)

Any resolution to a story that does not pay due regard to the story’s internal logic and that is so unlikely that it challenges suspension of disbelief, and presumably allows the author, director, or developer to end the story in the way that he or she desired (Ex. the protagonist waking up, realizing it was all a dream. 2nd Ex. another hero coming in out of an unexpected place to save someone at the last second).

“Oh, now I’m backed into a corner, and can’t devise a way out. I could sure use a deus ex machina right about now!”

(literally) A god from the/a machine.