Plot Ex Machina

Well, that's awfully convenient, innit?

When it isn't a person or thing that Saves The Day, but instead a plot-convenient event. This covers many UnTrashes as there are noticeably more Plot Ex Machina UnTrashes than there are regular Ex Machina UnTrashes. This can get around to annoying the audience to degrees other terrible UnTrashes can only dream of.

Plot Ex Machina isn't a stand-alone UnTrash because there are so many other UnTrashes being nested under it. Besides, it also can't be played in fiction in a form that isn't a nested UnTrash.