Deus ex machina

A deus ex machina (Latin, "god from the machine") is a plot device whereby a previously intractable problem is suddenly and abruptly solved with an often contrived introduction of a new character, ability, or object. It is generally considered to be a poor storytelling technique by critics because it undermines the story's internal logic, although sometimes the story itself is designed to have an intention to go that route.

Nietzsche argues that the deus ex machina creates a false sense of consolation that ought not to be sought in phenomena and this denigration of the plot device has prevailed in critical opinion. Some 20th-century revisionist criticism suggests that the deus ex machina cannot be viewed in these simplified terms and argues rather that the device allows mortals to "probe" their relationship with the divine. Rush Rehm in particular cites examples of Greek tragedy in which the deus ex machina serves to complicate the lives and attitudes of characters confronted by the deity whilst simultaneously bringing the drama home to its audience.