deusex machina

deus ex ma·chi·na (ĕks mäʹkə-nə, -nä', măkʹə-nə) n.

1. In Greek and Roman drama, a god lowered by stage machinery to resolve a plot or extricate the protagonist from a difficult situation.

2. An unexpected, artificial, or improbable character, device, or event introduced suddenly in a work of fiction or drama to resolve a situation or untangle a plot.

3. A person or event that provides a sudden and unexpected solution to a difficulty.

  [New Latin deus ex māchinā: Latin deus, god + Latin ex, from + Latin māchinā, ablative of māchina, machine (translation of Greek theos apo mēkhanēs).]

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