In comic books, billionaires are often found spending their time saving the Earth.

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In fact, is there an actual price-tag for saving the earth?

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Well, saving the Earth might be a reasonable pursuit.

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An example of Mass Effect ending with deus ex machina would be: the Reapers win the battle of Earth and are seemingly unstoppable, suddenly, and with no previous justification, an even more advanced race emerges from deep space and destroys the Reapers, saving Earth.

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This was actually launched in 1998, but it followed a complicated fuel-saving orbit that sent it around the sun and back to Earth, to be slung towards Mars at the same time as the other missions took off.

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